Add handling for immersive fullscreen to the zoom bubble

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

Index: chrome/browser/ui/views/frame/immersive_mode_controller.h
diff --git a/chrome/browser/ui/views/frame/immersive_mode_controller.h b/chrome/browser/ui/views/frame/immersive_mode_controller.h
index 8978e7fbbb90b1f67c386115549cba94e9acef3d..08a1ea36ab8faf7f7e512c23ab7c42b076c66e0c 100644
--- a/chrome/browser/ui/views/frame/immersive_mode_controller.h
+++ b/chrome/browser/ui/views/frame/immersive_mode_controller.h
@@ -39,6 +39,14 @@ class ImmersiveModeController {
     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.
@@ -120,6 +128,9 @@ class ImmersiveModeController {
 
   // 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 {