Add handling for immersive fullscreen to the zoom bubble

chrome/browser/ui/views/frame/immersive_mode_controller.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_FRAME_IMMERSIVE_MODE_CONTROLLER_H_
 #define CHROME_BROWSER_UI_VIEWS_FRAME_IMMERSIVE_MODE_CONTROLLER_H_
 
 #include "base/compiler_specific.h"
 
 class BookmarkBarView;
@@ skipping 21 matching lines @@
 // screen. The tab strip is optionally painted with miniature "tab indicator"
 // rectangles.
 // Currently, immersive mode is only available for Chrome OS.
 class ImmersiveModeController {
  public:
   enum AnimateReveal {
     ANIMATE_REVEAL_YES,
     ANIMATE_REVEAL_NO
   };
 
+  class Observer {
+   public:
+    virtual ~Observer() {}
+
+    // Called when a reveal of the top-of-window views has been initiated.
+    virtual void OnStartedImmersiveReveal() {}

[James Cook, 2013/06/17 16:13:41]

nit: OnImmersiveRevealStarted()?  Might be a bit more similar to
FullscreenStateChanged() below, etc.

+  };
+
   class Delegate {
    public:
     // Returns the bookmark bar, or NULL if the window does not support one.
     virtual BookmarkBarView* GetBookmarkBar() = 0;
 
     // Returns the browser's FullscreenController.
     virtual FullscreenController* GetFullscreenController() = 0;
 
     // Notifies the delegate that fullscreen has been entered or exited.
     virtual void FullscreenStateChanged() = 0;
@@ skipping 61 matching lines @@
   virtual void AnchorWidgetToTopContainer(views::Widget* widget,
                                           int y_offset) = 0;
 
   // Stops managing |widget|'s y position.
   // Closes the top-of-window views if no locks or other anchored widgets are
   // keeping the top-of-window views revealed.
   virtual void UnanchorWidgetFromTopContainer(views::Widget* widget) = 0;
 
   // Called by the TopContainerView to indicate that its bounds have changed.
   virtual void OnTopContainerBoundsChanged() = 0;
+
+  virtual void AddObserver(Observer* observer) = 0;
+  virtual void RemoveObserver(Observer* observer) = 0;
 };
 
 namespace chrome {
 
 // Implemented in immersive_mode_controller_factory.cc.
 ImmersiveModeController* CreateImmersiveModeController();
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_UI_VIEWS_FRAME_IMMERSIVE_MODE_CONTROLLER_H_