ash: ozone: apply transformation to events outside the root window

ui/ozone/platform/dri/dri_window_manager.h

 // Copyright 2014 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_OZONE_PLATFORM_DRI_DRI_WINDOW_MANAGER_H_
 #define UI_OZONE_PLATFORM_DRI_DRI_WINDOW_MANAGER_H_
 
 #include <map>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 21 matching lines @@
   // Removes the window association for |widget|. Note: |widget| must be
   // associated with a window when calling this function.
   void RemoveWindow(gfx::AcceleratedWidget widget);
 
   // Returns the window associated with |widget|. Note: This function should
   // only be called if a valid window has been associated.
   DriWindow* GetWindow(gfx::AcceleratedWidget widget);
 
   DriCursor* cursor() const { return cursor_.get(); }
 
+  // Tries to set a given widget as the recipient for events. It will
+  // fail if there is already another widget as recipient.
+  void GrabEvents(gfx::AcceleratedWidget widget);
+
+  // Unsets a given widget as the recipient for events.
+  void UngrabEvents(gfx::AcceleratedWidget widget);
+
+  // Gets the current widget recipient of mouse events.
+  gfx::AcceleratedWidget event_grabber() const { return event_grabber_; }
+
  private:
   // Reset the cursor location based on the list of active windows.
   void ResetCursorLocation();
 
   typedef std::map<gfx::AcceleratedWidget, DriWindow*> WidgetToWindowMap;
 
   gfx::AcceleratedWidget last_allocated_widget_;
   WidgetToWindowMap window_map_;
 
   scoped_ptr<DriCursor> cursor_;
 
+  gfx::AcceleratedWidget event_grabber_;
+
   DISALLOW_COPY_AND_ASSIGN(DriWindowManager);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRI_DRI_WINDOW_MANAGER_H_