Make event-targeting asynchronous in window server.

services/ui/ws/event_targeter_delegate.h

Index: services/ui/ws/event_targeter_delegate.h
diff --git a/services/ui/ws/event_targeter_delegate.h b/services/ui/ws/event_targeter_delegate.h
index 2e46860090028b3f5a8e6ee0645e716bc256406a..f9f00d405f52adb46a62768cac61f9cce1fdc654 100644
--- a/services/ui/ws/event_targeter_delegate.h
+++ b/services/ui/ws/event_targeter_delegate.h
@@ -23,6 +23,10 @@ class EventTargeterDelegate {
   virtual ServerWindow* GetRootWindowContaining(gfx::Point* location_in_display,
                                                 int64_t* display_id) = 0;
 
+  // Calls EventDispatcherDelegate::ProcessNextAvailableEvent, see
+  // event_dispatcher_delegate.h for details.
+  virtual void ProcessNextAvailableEvent() = 0;
+
  protected:
   virtual ~EventTargeterDelegate() {}
 };