Fixing problem with not showing bubble

ash/wm/workspace/frame_maximize_button.cc

 // Copyright (c) 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.
 
 #include "ash/wm/workspace/frame_maximize_button.h"
 
 #include "ash/launcher/launcher.h"
 #include "ash/screen_ash.h"
 #include "ash/shell.h"
 #include "ash/wm/property_util.h"
@@ skipping 178 matching lines @@
 }
 
 bool FrameMaximizeButton::OnMousePressed(const ui::MouseEvent& event) {
   is_snap_enabled_ = event.IsLeftMouseButton();
   if (is_snap_enabled_)
     ProcessStartEvent(event);
   ImageButton::OnMousePressed(event);
   return true;
 }
 
-void FrameMaximizeButton::OnMouseEntered(const ui::MouseEvent& event) {
+void FrameMaximizeButton::OnMouseMoved(const ui::MouseEvent& event) {
+  // Note: This event only gets triggered when the mouse moves over the button.
   ImageButton::OnMouseEntered(event);

[sky, 2012/08/14 20:11:38]

ImageButton::OnMouseMoved

   if (!maximizer_.get()) {
     DCHECK(GetWidget());
     if (!window_) {
       window_ = frame_->GetWidget()->GetNativeWindow();
       window_->AddObserver(this);
     }
     maximizer_.reset(new MaximizeBubbleController(
         this,
         frame_->GetWidget()->IsMaximized(),
         bubble_appearance_delay_ms_));
@@ skipping 285 matching lines @@
       break;
     case SNAP_RESTORE:
       frame_->GetWidget()->Restore();
       break;
     case SNAP_NONE:
       NOTREACHED();
   }
 }
 
 }  // namespace ash