Provide access to the WindowEventDispatcher as a ui::EventProcessor.

ui/aura/window_tree_host.cc

 // Copyright (c) 2013 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 "ui/aura/window_tree_host.h"
 
 #include "base/debug/trace_event.h"
 #include "ui/aura/client/capture_client.h"
 #include "ui/aura/client/cursor_client.h"
 #include "ui/aura/env.h"
@@ skipping 107 matching lines @@
 }
 
 void WindowTreeHost::AddObserver(WindowTreeHostObserver* observer) {
   observers_.AddObserver(observer);
 }
 
 void WindowTreeHost::RemoveObserver(WindowTreeHostObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
+ui::EventProcessor* WindowTreeHost::event_processor() {
+  return dispatcher();
+}
+
 void WindowTreeHost::SetRootWindowTransformer(
     scoped_ptr<RootWindowTransformer> transformer) {
   transformer_ = transformer.Pass();
   SetInsets(transformer_->GetHostInsets());
   window()->SetTransform(transformer_->GetTransform());
   // If the layer is not animating, then we need to update the root window
   // size immediately.
   if (!window()->layer()->GetAnimator()->is_animating())
     UpdateRootWindowSize(GetBounds().size());
 }
@@ skipping 172 matching lines @@
   client::CursorClient* cursor_client = client::GetCursorClient(window());
   if (cursor_client) {
     const gfx::Display& display =
         gfx::Screen::GetScreenFor(window())->GetDisplayNearestWindow(window());
     cursor_client->SetDisplay(display);
   }
   dispatcher()->OnCursorMovedToRootLocation(root_location);
 }
 
 }  // namespace aura