Re-enable Eager Gesture Recognition on Aura

ui/aura/window_event_dispatcher.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_AURA_WINDOW_EVENT_DISPATCHER_H_
 #define UI_AURA_WINDOW_EVENT_DISPATCHER_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 102 matching lines @@
 
   // TODO(beng): This is only needed because this cleanup needs to happen after
   //             all other observers are notified of OnWindowDestroying() but
   //             before OnWindowDestroyed() is sent (i.e. while the window
   //             hierarchy is still intact). This didn't seem worth adding a
   //             generic notification for as only this class needs to implement
   //             it. I would however like to find a way to do this via an
   //             observer.
   void OnPostNotifiedWindowDestroying(Window* window);
 
+  // Called when a Window wants to process a touch event asynchronously. Returns
+  // false if the event should not be forwarded.
+  virtual bool OnForwardingAsyncTouchEvent(ui::TouchEvent* event);

[sadrul, 2014/10/23 15:56:34]

why virtual?

'Forwarding' here doesn't really make a lot of sense. Can we call this something
like 'CanProcessTouchEventAsync' instead?

[tdresser, 2014/10/27 15:52:32]

Done.
CanProcessTouchEventAsync makes it sound side-effect free, which it definitely
isn't.

How about 'OnProcessingTouchEventAsync'?

+
  private:
   FRIEND_TEST_ALL_PREFIXES(WindowEventDispatcherTest,
                            KeepTranslatedEventInRoot);
 
   friend class test::WindowEventDispatcherTestApi;
   friend class Window;
   friend class TestScreen;
 
   // The parameter for OnWindowHidden() to specify why window is hidden.
   enum WindowHiddenReason {
@@ skipping 130 matching lines @@
 
   // Used to schedule DispatchHeldEvents() when |move_hold_count_| goes to 0.
   base::WeakPtrFactory<WindowEventDispatcher> held_event_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowEventDispatcher);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_WINDOW_EVENT_DISPATCHER_H_