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

ui/aura/window_event_dispatcher.cc

Index: ui/aura/window_event_dispatcher.cc
diff --git a/ui/aura/window_event_dispatcher.cc b/ui/aura/window_event_dispatcher.cc
index 92b3b9f10092d2d998afd1fefd028f4d8ded4d84..b6fe01510e0d9d1cce3e776cbb9d856573fafb73 100644
--- a/ui/aura/window_event_dispatcher.cc
+++ b/ui/aura/window_event_dispatcher.cc
@@ -102,7 +102,8 @@ WindowEventDispatcher::~WindowEventDispatcher() {
 
 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) {
@@ -115,6 +116,11 @@ void WindowEventDispatcher::RepostEvent(const ui::LocatedEvent& event) {
         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();