@Override
 public void onContentChanged() {
   if (mTabModelSelector == null) {
     // Not yet initialized, onContentChanged() will eventually get called by
     // setTabModelSelector.
     return;
   }
   Tab tab = mTabModelSelector.getCurrentTab();
   setTab(tab);
 }
  /** Triggered when the selected tab has changed. */
  private void refreshSelectedTab() {
    ChromeTab tab = null;
    if (mPreselectedTabId != Tab.INVALID_TAB_ID) {
      tab = ChromeTab.fromTab(mTabModelSelector.getTabById(mPreselectedTabId));
    }
    if (tab == null) tab = ChromeTab.fromTab(mTabModelSelector.getCurrentTab());

    boolean wasIncognito = mToolbarModel.isIncognito();
    ChromeTab previousTab = ChromeTab.fromTab(mToolbarModel.getTab());

    boolean isIncognito = tab != null ? tab.isIncognito() : mTabModelSelector.isIncognitoSelected();
    mToolbarModel.setTab(tab, isIncognito);

    updateCurrentTabDisplayStatus();
    if (previousTab != tab || wasIncognito != isIncognito) {
      if (previousTab != tab) {
        if (previousTab != null) previousTab.removeObserver(mTabObserver);
        if (tab != null) tab.addObserver(mTabObserver);
      }
      int defaultPrimaryColor =
          isIncognito
              ? mToolbar.getResources().getColor(R.color.incognito_primary_color)
              : mToolbar.getResources().getColor(R.color.default_primary_color);
      int primaryColor =
          (tab != null && tab.getWebContents() != null)
              ? tab.getWebContents().getThemeColor(defaultPrimaryColor)
              : defaultPrimaryColor;
      updatePrimaryColor(primaryColor);

      mToolbar.onTabOrModelChanged();

      if (tab != null
          && tab.getWebContents() != null
          && tab.getWebContents().isLoadingToDifferentDocument()) {
        mToolbar.onNavigatedToDifferentPage();
      }
    }

    Profile profile = mTabModelSelector.getModel(isIncognito).getProfile();
    if (mCurrentProfile != profile) {
      if (mBookmarksBridge != null) mBookmarksBridge.destroy();
      mBookmarksBridge = new BookmarksBridge(profile);
      mBookmarksBridge.addObserver(mBookmarksObserver);
      mLocationBar.setAutocompleteProfile(profile);
      mCurrentProfile = profile;
    }
  }