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

ui/ozone/platform/dri/dri_window_manager.h

Index: ui/ozone/platform/dri/dri_window_manager.h
diff --git a/ui/ozone/platform/dri/dri_window_manager.h b/ui/ozone/platform/dri/dri_window_manager.h
index 5a03957b8cfcba18cf7c7a0841b5c844d3e2ab45..eb82859647588f72b5461db7aaa6cbf52914af98 100644
--- a/ui/ozone/platform/dri/dri_window_manager.h
+++ b/ui/ozone/platform/dri/dri_window_manager.h
@@ -39,6 +39,17 @@ class DriWindowManager {
 
   DriCursor* cursor() const { return cursor_.get(); }
 
+  // Sets a given widget as the recipient for mouse events.
+  void GrabMouseEvents(gfx::AcceleratedWidget widget);
+
+  // Unsets a given widget as the recipient for mouse events.
+  void UngrabMouseEvents(gfx::AcceleratedWidget widget);
+
+  // Gets the widget current recipient of mouse events.
+  gfx::AcceleratedWidget mouse_events_grabber() const {
+    return mouse_events_grabber_;
+  }
+
  private:
   // Reset the cursor location based on the list of active windows.
   void ResetCursorLocation();
@@ -50,6 +61,8 @@ class DriWindowManager {
 
   scoped_ptr<DriCursor> cursor_;
 
+  gfx::AcceleratedWidget mouse_events_grabber_;
+
   DISALLOW_COPY_AND_ASSIGN(DriWindowManager);
 };