Don't send touch events to windows like menus when the touch occurs outside the menu bounds.

ui/aura/window_event_dispatcher.cc

 // 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.
 
 #include "ui/aura/window_event_dispatcher.h"
 
 #include <stddef.h>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 84 matching lines @@
 }
 
 WindowEventDispatcher::~WindowEventDispatcher() {
   TRACE_EVENT0("shutdown", "WindowEventDispatcher::Destructor");
   Env::GetInstance()->RemoveObserver(this);
   ui::GestureRecognizer::Get()->RemoveGestureEventHelper(this);
 }
 
 void WindowEventDispatcher::RepostEvent(const ui::LocatedEvent& event) {
   DCHECK(event.type() == ui::ET_MOUSE_PRESSED ||
-         event.type() == ui::ET_GESTURE_TAP_DOWN);
+         event.type() == ui::ET_GESTURE_TAP_DOWN ||
+         event.type() == ui::ET_TOUCH_PRESSED);

[sky, 2016/01/12 21:16:42]

You'll want to update the description in the .h for this, and add test coverage
here.

[ananta, 2016/01/13 01:21:24]

Done.

   // We allow for only one outstanding repostable event. This is used
   // in exiting context menus.  A dropped repost request is allowed.
   if (event.type() == ui::ET_MOUSE_PRESSED) {
     held_repostable_event_.reset(
         new ui::MouseEvent(
             static_cast<const ui::MouseEvent&>(event),
             static_cast<aura::Window*>(event.target()),
             window()));
     base::MessageLoop::current()->PostNonNestableTask(
         FROM_HERE, base::Bind(
             base::IgnoreResult(&WindowEventDispatcher::DispatchHeldEvents),
             repost_event_factory_.GetWeakPtr()));
+  } else if (event.type() == ui::ET_TOUCH_PRESSED) {
+    DispatchDetails details = OnEventFromSource(

[sky, 2016/01/12 21:16:42]

Doesn't this process immediatley right here? Don't you need to do something like
ET_MOUSE_PRESSED and PostNonNestableTask?

[ananta, 2016/01/13 01:21:24]

Done.

+        const_cast<ui::LocatedEvent*>(&event));
+    if (details.dispatcher_destroyed)
+      return;
   } else {
     DCHECK(event.type() == ui::ET_GESTURE_TAP_DOWN);
     held_repostable_event_.reset();
     // TODO(rbyers): Reposing of gestures is tricky to get
     // right, so it's not yet supported.  crbug.com/170987.
   }
 }
 
 void WindowEventDispatcher::OnMouseEventsEnableStateChanged(bool enabled) {
   // Send entered / exited so that visual state can be updated to match
@@ skipping 786 matching lines @@
   }
 
   // This flag is set depending on the gestures recognized in the call above,
   // and needs to propagate with the forwarded event.
   event->set_may_cause_scrolling(orig_event.may_cause_scrolling());
 
   return PreDispatchLocatedEvent(target, event);
 }
 
 }  // namespace aura