private Tab createMainTab() {
    CustomTabsConnection customTabsConnection =
            CustomTabsConnection.getInstance(getApplication());
    String url = getUrlToLoad();
    // Get any referrer that has been explicitly set by the app.
    String referrerUrl = IntentHandler.getReferrerUrlIncludingExtraHeaders(getIntent(), this);
    if (referrerUrl == null) {
        Referrer referrer = customTabsConnection.getReferrerForSession(mSession);
        if (referrer != null) referrerUrl = referrer.getUrl();
    }
    Tab tab = new Tab(TabIdManager.getInstance().generateValidId(Tab.INVALID_TAB_ID),
            Tab.INVALID_TAB_ID, false, this, getWindowAndroid(),
            TabLaunchType.FROM_EXTERNAL_APP, null, null);
    tab.setAppAssociatedWith(customTabsConnection.getClientPackageNameForSession(mSession));

    mPrerenderedUrl = customTabsConnection.getPrerenderedUrl(mSession);
    WebContents webContents =
            customTabsConnection.takePrerenderedUrl(mSession, url, referrerUrl);
    mHasPrerendered = webContents != null;
    if (webContents == null) webContents = customTabsConnection.takeSpareWebContents();
    if (webContents == null) webContents = WebContentsFactory.createWebContents(false, false);
    tab.initialize(webContents, getTabContentManager(),
            new CustomTabDelegateFactory(mIntentDataProvider.shouldEnableUrlBarHiding()), false,
            false);
    tab.getTabRedirectHandler().updateIntent(getIntent());
    tab.getView().requestFocus();
    mTabObserver = new CustomTabObserver(getApplication(), mSession);
    tab.addObserver(mTabObserver);
    return tab;
}
 

@Override
public void finishNativeInitialization() {
    super.finishNativeInitialization();

    mTab = new Tab(TabIdManager.getInstance().generateValidId(Tab.INVALID_TAB_ID),
            Tab.INVALID_TAB_ID, false, this, getWindowAndroid(),
            TabLaunchType.FROM_EXTERNAL_APP, null, null);
    mTab.initialize(WebContentsFactory.createWebContents(false, false), null,
            new TabDelegateFactory(), false, false);
    mTab.loadUrl(new LoadUrlParams("about:blank"));

    mSearchBoxDataProvider.onNativeLibraryReady(mTab);
    mSearchBox.onNativeLibraryReady();

    // Force the user to choose a search engine if they have to.
    final Callback<Boolean> deferredCallback = new Callback<Boolean>() {
        @Override
        public void onResult(Boolean result) {
            if (result == null || !result.booleanValue()) {
                Log.e(TAG, "User failed to select a default search engine.");
                finish();
                return;
            }

            finishDeferredInitialization();
        }
    };
    if (!getActivityDelegate().showSearchEngineDialogIfNeeded(this, deferredCallback)) {
        mHandler.post(new Runnable() {
            @Override
            public void run() {
                finishDeferredInitialization();
            }
        });
    }
}
 

private Tab createMainTab() {
    CustomTabsConnection connection = CustomTabsConnection.getInstance(getApplication());
    String url = getUrlToLoad();
    String referrerUrl = connection.getReferrer(mSession, getIntent());
    Tab tab = new Tab(Tab.INVALID_TAB_ID, Tab.INVALID_TAB_ID, false, this, getWindowAndroid(),
            TabLaunchType.FROM_EXTERNAL_APP, null, null);
    tab.setAppAssociatedWith(connection.getClientPackageNameForSession(mSession));

    int webContentsStateOnLaunch = WEBCONTENTS_STATE_NO_WEBCONTENTS;
    WebContents webContents = connection.takePrerenderedUrl(mSession, url, referrerUrl);
    mUsingPrerender = webContents != null;
    if (mUsingPrerender) webContentsStateOnLaunch = WEBCONTENTS_STATE_PRERENDERED_WEBCONTENTS;
    if (!mUsingPrerender) {
        webContents = WarmupManager.getInstance().takeSpareWebContents(false, false);
        if (webContents != null) webContentsStateOnLaunch = WEBCONTENTS_STATE_SPARE_WEBCONTENTS;
    }
    RecordHistogram.recordEnumeratedHistogram("CustomTabs.WebContentsStateOnLaunch",
            webContentsStateOnLaunch, WEBCONTENTS_STATE_MAX);
    if (webContents == null) {
        webContents = WebContentsFactory.createWebContentsWithWarmRenderer(false, false);
    }
    if (!mUsingPrerender) {
        connection.resetPostMessageHandlerForSession(mSession, webContents);
    }
    tab.initialize(
            webContents, getTabContentManager(),
            new CustomTabDelegateFactory(
                    mIntentDataProvider.shouldEnableUrlBarHiding(),
                    mIntentDataProvider.isOpenedByChrome(),
                    getFullscreenManager().getBrowserVisibilityDelegate()),
            false, false);

    if (mIntentDataProvider.shouldEnableEmbeddedMediaExperience()) {
        tab.enableEmbeddedMediaExperience(true);
    }

    initializeMainTab(tab);
    return tab;
}
 

/** Creates a spare {@link WebContents}, if none exists. */
private void createSpareWebContents() {
    ThreadUtils.assertOnUiThread();
    if (mSpareWebContents != null) return;
    mSpareWebContents = WebContentsFactory.createWebContentsWithWarmRenderer(false, false);
}
 

/**
 * Initializes {@link Tab} with {@code webContents}.  If {@code webContents} is {@code null} a
 * new {@link WebContents} will be created for this {@link Tab}.
 * @param webContents       A {@link WebContents} object or {@code null} if one should be
 *                          created.
 * @param tabContentManager A {@link TabContentManager} instance or {@code null} if the web
 *                          content will be managed/displayed manually.
 * @param delegateFactory   The {@link TabDelegateFactory} to be used for delegate creation.
 * @param initiallyHidden   Only used if {@code webContents} is {@code null}.  Determines
 *                          whether or not the newly created {@link WebContents} will be hidden
 *                          or not.
 * @param unfreeze          Whether there should be an attempt to restore state at the end of
 *                          the initialization.
 */
public final void initialize(WebContents webContents, TabContentManager tabContentManager,
        TabDelegateFactory delegateFactory, boolean initiallyHidden, boolean unfreeze) {
    try {
        TraceEvent.begin("Tab.initialize");

        mDelegateFactory = delegateFactory;
        initializeNative();

        RevenueStats.getInstance().tabCreated(this);

        if (AppBannerManager.isEnabled()) {
            mAppBannerManager = mDelegateFactory.createAppBannerManager(this);
            if (mAppBannerManager != null) addObserver(mAppBannerManager);
        }

        mTopControlsVisibilityDelegate =
                mDelegateFactory.createTopControlsVisibilityDelegate(this);

        // Attach the TabContentManager if we have one.  This will bind this Tab's content layer
        // to this manager.
        // TODO(dtrainor): Remove this and move to a pull model instead of pushing the layer.
        attachTabContentManager(tabContentManager);

        // If there is a frozen WebContents state or a pending lazy load, don't create a new
        // WebContents.
        if (getFrozenContentsState() != null || getPendingLoadParams() != null) {
            if (unfreeze) unfreezeContents();
            return;
        }

        boolean creatingWebContents = webContents == null;
        if (creatingWebContents) {
            webContents = WebContentsFactory.createWebContents(isIncognito(), initiallyHidden);
        }

        ContentViewCore contentViewCore = ContentViewCore.fromWebContents(webContents);

        if (contentViewCore == null) {
            initContentViewCore(webContents);
        } else {
            setContentViewCore(contentViewCore);
        }

        if (!creatingWebContents && webContents.isLoadingToDifferentDocument()) {
            didStartPageLoad(webContents.getUrl(), false);
        }
    } finally {
        if (mTimestampMillis == INVALID_TIMESTAMP) {
            mTimestampMillis = System.currentTimeMillis();
        }

        TraceEvent.end("Tab.initialize");
    }
}
 

private Tab createMainTab() {
    CustomTabsConnection customTabsConnection =
            CustomTabsConnection.getInstance(getApplication());
    String url = getUrlToLoad();
    // Get any referrer that has been explicitly set by the app.
    String referrerUrl = IntentHandler.getReferrerUrlIncludingExtraHeaders(getIntent(), this);
    if (referrerUrl == null) {
        Referrer referrer = customTabsConnection.getReferrerForSession(mSession);
        if (referrer != null) referrerUrl = referrer.getUrl();
    }
    Tab tab = new Tab(TabIdManager.getInstance().generateValidId(Tab.INVALID_TAB_ID),
            Tab.INVALID_TAB_ID, false, this, getWindowAndroid(),
            TabLaunchType.FROM_EXTERNAL_APP, null, null);
    tab.setAppAssociatedWith(customTabsConnection.getClientPackageNameForSession(mSession));

    mPrerenderedUrl = customTabsConnection.getPrerenderedUrl(mSession);
    int webContentsStateOnLaunch = WEBCONTENTS_STATE_NO_WEBCONTENTS;
    WebContents webContents =
            customTabsConnection.takePrerenderedUrl(mSession, url, referrerUrl);
    mHasPrerendered = webContents != null;
    if (mHasPrerendered) webContentsStateOnLaunch = WEBCONTENTS_STATE_PRERENDERED_WEBCONTENTS;
    if (!mHasPrerendered) {
        webContents = WarmupManager.getInstance().takeSpareWebContents(false, false);
        if (webContents != null) webContentsStateOnLaunch = WEBCONTENTS_STATE_SPARE_WEBCONTENTS;
    }
    RecordHistogram.recordEnumeratedHistogram("CustomTabs.WebcontentsStateOnLaunch",
            webContentsStateOnLaunch, WEBCONTENTS_STATE_MAX);
    if (webContents == null) webContents = WebContentsFactory.createWebContents(false, false);
    if (!mHasPrerendered) {
        customTabsConnection.resetPostMessageHandlerForSession(mSession, webContents);
    }
    tab.initialize(
            webContents, getTabContentManager(),
            new CustomTabDelegateFactory(
                    mIntentDataProvider.shouldEnableUrlBarHiding(),
                    mIntentDataProvider.isOpenedByChrome(),
                    getFullscreenManager().getBrowserVisibilityDelegate()),
            false, false);
    initializeMainTab(tab);
    return tab;
}
 

/**
 * Initializes {@link Tab} with {@code webContents}.  If {@code webContents} is {@code null} a
 * new {@link WebContents} will be created for this {@link Tab}.
 * @param webContents       A {@link WebContents} object or {@code null} if one should be
 *                          created.
 * @param tabContentManager A {@link TabContentManager} instance or {@code null} if the web
 *                          content will be managed/displayed manually.
 * @param delegateFactory   The {@link TabDelegateFactory} to be used for delegate creation.
 * @param initiallyHidden   Only used if {@code webContents} is {@code null}.  Determines
 *                          whether or not the newly created {@link WebContents} will be hidden
 *                          or not.
 * @param unfreeze          Whether there should be an attempt to restore state at the end of
 *                          the initialization.
 */
public final void initialize(WebContents webContents, TabContentManager tabContentManager,
        TabDelegateFactory delegateFactory, boolean initiallyHidden, boolean unfreeze) {
    try {
        TraceEvent.begin("Tab.initialize");

        mDelegateFactory = delegateFactory;
        initializeNative();

        RevenueStats.getInstance().tabCreated(this);

        mBrowserControlsVisibilityDelegate =
                mDelegateFactory.createBrowserControlsVisibilityDelegate(this);

        mBlimp = BlimpClientContextFactory
                         .getBlimpClientContextForProfile(
                                 Profile.getLastUsedProfile().getOriginalProfile())
                         .isBlimpEnabled()
                && !mIncognito;

        // Attach the TabContentManager if we have one.  This will bind this Tab's content layer
        // to this manager.
        // TODO(dtrainor): Remove this and move to a pull model instead of pushing the layer.
        attachTabContentManager(tabContentManager);

        // If there is a frozen WebContents state or a pending lazy load, don't create a new
        // WebContents.
        if (getFrozenContentsState() != null || getPendingLoadParams() != null) {
            if (unfreeze) unfreezeContents();
            return;
        }

        if (isBlimpTab() && getBlimpContents() == null) {
            Profile profile = Profile.getLastUsedProfile();
            if (mIncognito) profile = profile.getOffTheRecordProfile();
            mBlimpContents = nativeInitBlimpContents(
                    mNativeTabAndroid, profile, mWindowAndroid.getNativePointer());
            if (mBlimpContents != null) {
                mBlimpContentsObserver = new TabBlimpContentsObserver(this);
                mBlimpContents.addObserver(mBlimpContentsObserver);
            } else {
                mBlimp = false;
            }
        }

        boolean creatingWebContents = webContents == null;
        if (creatingWebContents) {
            webContents = WarmupManager.getInstance().takeSpareWebContents(
                    isIncognito(), initiallyHidden);
            if (webContents == null) {
                webContents =
                        WebContentsFactory.createWebContents(isIncognito(), initiallyHidden);
            }
        }

        ContentViewCore contentViewCore = ContentViewCore.fromWebContents(webContents);

        if (contentViewCore == null) {
            initContentViewCore(webContents);
        } else {
            setContentViewCore(contentViewCore);
        }

        if (!creatingWebContents && webContents.isLoadingToDifferentDocument()) {
            didStartPageLoad(webContents.getUrl(), false);
        }

        getAppBannerManager().setIsEnabledForTab(mDelegateFactory.canShowAppBanners(this));
    } finally {
        if (mTimestampMillis == INVALID_TIMESTAMP) {
            mTimestampMillis = System.currentTimeMillis();
        }

        TraceEvent.end("Tab.initialize");
    }
}
 

/**
 * Initializes {@link Tab} with {@code webContents}.  If {@code webContents} is {@code null} a
 * new {@link WebContents} will be created for this {@link Tab}.
 * @param webContents       A {@link WebContents} object or {@code null} if one should be
 *                          created.
 * @param tabContentManager A {@link TabContentManager} instance or {@code null} if the web
 *                          content will be managed/displayed manually.
 * @param delegateFactory   The {@link TabDelegateFactory} to be used for delegate creation.
 * @param initiallyHidden   Only used if {@code webContents} is {@code null}.  Determines
 *                          whether or not the newly created {@link WebContents} will be hidden
 *                          or not.
 * @param unfreeze          Whether there should be an attempt to restore state at the end of
 *                          the initialization.
 */
public final void initialize(WebContents webContents, TabContentManager tabContentManager,
        TabDelegateFactory delegateFactory, boolean initiallyHidden, boolean unfreeze) {
    try {
        TraceEvent.begin("Tab.initialize");

        mDelegateFactory = delegateFactory;
        initializeNative();

        RevenueStats.getInstance().tabCreated(this);

        mBrowserControlsVisibilityDelegate =
                mDelegateFactory.createBrowserControlsVisibilityDelegate(this);

        // Attach the TabContentManager if we have one.  This will bind this Tab's content layer
        // to this manager.
        // TODO(dtrainor): Remove this and move to a pull model instead of pushing the layer.
        attachTabContentManager(tabContentManager);

        // If there is a frozen WebContents state or a pending lazy load, don't create a new
        // WebContents.
        if (getFrozenContentsState() != null || getPendingLoadParams() != null) {
            if (unfreeze) unfreezeContents();
            return;
        }

        boolean creatingWebContents = webContents == null;
        if (creatingWebContents) {
            webContents = WarmupManager.getInstance().takeSpareWebContents(
                    isIncognito(), initiallyHidden);
            if (webContents == null) {
                webContents =
                        WebContentsFactory.createWebContents(isIncognito(), initiallyHidden);
            }
        }

        ContentViewCore contentViewCore = ContentViewCore.fromWebContents(webContents);

        if (contentViewCore == null) {
            initContentViewCore(webContents);
        } else {
            setContentViewCore(contentViewCore);
        }

        mContentViewCore.addImeEventObserver(new ImeEventObserver() {
            @Override
            public void onImeEvent() {
                // Some text was set in the page. Don't reuse it if a tab is
                // open from the same external application, we might lose some
                // user data.
                mAppAssociatedWith = null;
            }

            @Override
            public void onNodeAttributeUpdated(boolean editable, boolean password) {
                if (getFullscreenManager() == null) return;
                updateFullscreenEnabledState();
            }
        });

        if (!creatingWebContents && webContents.isLoadingToDifferentDocument()) {
            didStartPageLoad(webContents.getUrl(), false);
        }

        getAppBannerManager().setIsEnabledForTab(mDelegateFactory.canShowAppBanners(this));
    } finally {
        if (mTimestampMillis == INVALID_TIMESTAMP) {
            mTimestampMillis = System.currentTimeMillis();
        }

        TraceEvent.end("Tab.initialize");
    }
}
 

/**
 * Add a prerender for the given url and given content view dimensions.
 * <p>
 * The generated {@link WebContents} does not actually contain the prerendered contents but
 * must be used as the container that you load the prerendered URL into.
 *
 * @param profile The profile to use for the prerender.
 * @param url The url to prerender.
 * @param referrer The referrer for the prerender request.
 * @param width The width for the content view (render widget host view) for the prerender.
 * @param height The height for the content view (render widget host view) for the prerender.
 * @param prerenderOnCellular Whether the prerender should happen if the device has a cellular
 *                            connection.
 * @return The {@link WebContents} that is linked to this prerender. {@code null} if
 *         unsuccessful.
 */
public WebContents addPrerender(Profile profile, String url, String referrer, int width,
        int height, boolean prerenderOnCellular) {
    WebContents webContents = WebContentsFactory.createWebContents(false, false);
    if (addPrerender(profile, webContents, url, referrer, width, height, prerenderOnCellular)) {
        return webContents;
    }
    if (webContents != null) webContents.destroy();
    return null;
}
 

/**
 * Add a prerender for the given url and given content view dimensions.
 * <p>
 * The generated {@link WebContents} does not actually contain the prerendered contents but
 * must be used as the container that you load the prerendered URL into.
 *
 * @param profile The profile to use for the prerender.
 * @param url The url to prerender.
 * @param referrer The referrer for the prerender request.
 * @param bounds The bounds for the content view (render widget host view) for the prerender.
 * @param prerenderOnCellular Whether the prerender should happen if the device has a cellular
 *                            connection.
 * @return A Pair containing the dummy {@link WebContents} that is linked to this prerender
 *         through session storage namespace id and will be replaced soon and the prerendering
 *         {@link WebContents} that owned by the prerender manager.
 *         {@code null} if unsuccessful.
 */
public Pair<WebContents, WebContents> addPrerender(Profile profile, String url, String referrer,
        Rect bounds, boolean prerenderOnCellular) {
    WebContents dummyWebContents = WebContentsFactory.createWebContents(false, false);
    WebContents prerenderingWebContents =
            addPrerender(profile, dummyWebContents, url, referrer, bounds, prerenderOnCellular);
    if (dummyWebContents == null) return null;
    if (prerenderingWebContents != null) {
        return Pair.create(dummyWebContents, prerenderingWebContents);
    }
    dummyWebContents.destroy();
    return null;
}
 

/**
 * Add a prerender for the given url and given content view dimensions.
 * <p>
 * The generated {@link WebContents} does not actually contain the prerendered contents but
 * must be used as the container that you load the prerendered URL into.
 *
 * @param profile The profile to use for the prerender.
 * @param url The url to prerender.
 * @param referrer The referrer for the prerender request.
 * @param bounds The bounds for the content view (render widget host view) for the prerender.
 * @param prerenderOnCellular Whether the prerender should happen if the device has a cellular
 *                            connection.
 * @return A Pair containing the dummy {@link WebContents} that is linked to this prerender
 *         through session storage namespace id and will be replaced soon and the prerendering
 *         {@link WebContents} that owned by the prerender manager.
 *         {@code null} if unsuccessful.
 */
public Pair<WebContents, WebContents> addPrerender(Profile profile, String url, String referrer,
        Rect bounds, boolean prerenderOnCellular) {
    WebContents dummyWebContents = WebContentsFactory.createWebContents(false, false);
    WebContents prerenderingWebContents =
            addPrerender(profile, dummyWebContents, url, referrer, bounds, prerenderOnCellular);
    if (dummyWebContents == null) return null;
    if (prerenderingWebContents != null) {
        return Pair.create(dummyWebContents, prerenderingWebContents);
    }
    dummyWebContents.destroy();
    return null;
}