aura: Use EventPrcessor interface for dispatching touch events.

ui/aura/window_targeter.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_targeter.h"
 
 #include "ui/aura/client/capture_client.h"
 #include "ui/aura/client/event_client.h"
 #include "ui/aura/client/focus_client.h"
 #include "ui/aura/root_window.h"
@@ skipping 84 matching lines @@
     WindowEventDispatcher* dispatcher = root_window->GetDispatcher();
     if (dispatcher->mouse_pressed_handler())
       return dispatcher->mouse_pressed_handler();
   }
 
   // All events should be directed towards the capture window (if any).
   Window* capture_window = client::GetCaptureWindow(root_window);
   if (capture_window)
     return capture_window;
 
+  if (event.IsTouchEvent()) {
+    // Query the gesture-recognizer to find targets for touch events.
+    const ui::TouchEvent& touch = static_cast<const ui::TouchEvent&>(event);
+    ui::GestureConsumer* consumer =
+        ui::GestureRecognizer::Get()->GetTouchLockedTarget(touch);
+    if (consumer)
+      return static_cast<Window*>(consumer);
+    consumer =
+        ui::GestureRecognizer::Get()->GetTargetForLocation(event.location());
+    if (consumer)
+      return static_cast<Window*>(consumer);
+
+    // If the initial touch is outside the root window, target the root.
+    if (!root_window->bounds().Contains(event.location()))
+      return root_window;
+  }
+
   return NULL;
 }
 
 }  // namespace aura