Custom buttons should only handle accelerators when focused.

ui/views/controls/button/custom_button.h

 // 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.
 
 #ifndef UI_VIEWS_CONTROLS_BUTTON_CUSTOM_BUTTON_H_
 #define UI_VIEWS_CONTROLS_BUTTON_CUSTOM_BUTTON_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/events/event_constants.h"
 #include "ui/gfx/animation/animation_delegate.h"
@@ skipping 117 matching lines @@
       const ViewHierarchyChangedDetails& details) override;
   void OnBlur() override;
 
   // The button state (defined in implementation)
   ButtonState state_;
 
   // Hover animation.
   scoped_ptr<gfx::ThrobAnimation> hover_animation_;
 
  private:
+  // Returns true if this is not a top level widget. Virtual for tests.
+  virtual bool IsChildWidget() const;
+  // Returns true if the focus is not in a top level widget. Virtual for tests.
+  virtual bool FocusInChildWidget() const;
+
   // Should we animate when the state changes? Defaults to true.
   bool animate_on_state_change_;
 
   // Is the hover animation running because StartThrob was invoked?
   bool is_throbbing_;
 
   // Mouse event flags which can trigger button actions.
   int triggerable_event_flags_;
 
   // See description above setter.
   bool request_focus_on_press_;
 
   // The event on which the button should notify its listener.
   NotifyAction notify_action_;
 
   DISALLOW_COPY_AND_ASSIGN(CustomButton);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_BUTTON_CUSTOM_BUTTON_H_