FullscreenExitBubble temp UI for Mac.

chrome/browser/ui/browser.h

Index: chrome/browser/ui/browser.h
diff --git a/chrome/browser/ui/browser.h b/chrome/browser/ui/browser.h
index 00f644074f9a84ccbdbb0e5203827f63393130ce..1316b78de773a4c2592a1745ede869bcc1ecb591 100644
--- a/chrome/browser/ui/browser.h
+++ b/chrome/browser/ui/browser.h
@@ -839,6 +839,10 @@ class Browser : public TabHandlerDelegate,
   bool is_app() const;
   bool is_devtools() const;
 
+  // True when the current tab is in fullscreen mode, requested by
+  // webkitRequestFullScreen.
+  bool is_fullscreen_for_tab() const { return fullscreened_tab_ != NULL; }
+
  protected:
   // Wrapper for the factory method in BrowserWindow. This allows subclasses to
   // set their own window.
@@ -852,6 +856,7 @@ class Browser : public TabHandlerDelegate,
   FRIEND_TEST_ALL_PREFIXES(BrowserTest, AppIdSwitch);
   FRIEND_TEST_ALL_PREFIXES(BrowserTest, TestNewTabExitsFullscreen);
   FRIEND_TEST_ALL_PREFIXES(BrowserTest, TestTabExitsItselfFromFullscreen);
+  FRIEND_TEST_ALL_PREFIXES(BrowserTest, TabEntersPresentationModeFromWindowed);
   FRIEND_TEST_ALL_PREFIXES(BrowserInitTest, OpenAppShortcutNoPref);
   FRIEND_TEST_ALL_PREFIXES(BrowserInitTest, OpenAppShortcutWindowPref);
   FRIEND_TEST_ALL_PREFIXES(BrowserInitTest, OpenAppShortcutTabPref);
@@ -1421,10 +1426,11 @@ class Browser : public TabHandlerDelegate,
 
   BookmarkBar::State bookmark_bar_state_;
 
-  // Tab to notify when the browser exits fullscreen mode.
+  // If there is currently a tab in fullscreen mode (entered via
+  // webkitRequestFullScreen), this is its wrapper.
   TabContentsWrapper* fullscreened_tab_;
 
-  // True if the current tab is in fullscreen mode.
+  // True if the current tab entered fullscreen mode via webkitRequestFullScreen
   bool tab_caused_fullscreen_;
 
   DISALLOW_COPY_AND_ASSIGN(Browser);