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

ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc

 // Copyright (c) 2012 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/views/widget/desktop_aura/desktop_window_tree_host_win.h"
 
 #include "base/win/metro.h"
 #include "third_party/skia/include/core/SkPath.h"
 #include "third_party/skia/include/core/SkRegion.h"
 #include "ui/aura/client/aura_constants.h"
@@ skipping 78 matching lines @@
 }
 
 DesktopWindowTreeHostWin::~DesktopWindowTreeHostWin() {
   // WARNING: |content_window_| has been destroyed by the time we get here.
   desktop_native_widget_aura_->OnDesktopWindowTreeHostDestroyed(this);
   DestroyDispatcher();
 }
 
 // static
 aura::Window* DesktopWindowTreeHostWin::GetContentWindowForHWND(HWND hwnd) {
+  // All HWND's we create should have WindowTreeHost instances associated with
+  // them. There are exceptions like the content layer creating HWND's which
+  // are not associated with WindowTreeHost instances.
   aura::WindowTreeHost* host =
       aura::WindowTreeHost::GetForAcceleratedWidget(hwnd);
   return host ? host->window()->GetProperty(kContentWindowForRootWindow) : NULL;
 }
 
 // static
 ui::NativeTheme* DesktopWindowTreeHost::GetNativeTheme(aura::Window* window) {
   // Use NativeThemeWin for windows shown on the desktop, those not on the
   // desktop come from Ash and get NativeThemeAura.
   aura::WindowTreeHost* host = window ? window->GetHost() : NULL;
@@ skipping 849 matching lines @@
 
 // static
 DesktopWindowTreeHost* DesktopWindowTreeHost::Create(
     internal::NativeWidgetDelegate* native_widget_delegate,
     DesktopNativeWidgetAura* desktop_native_widget_aura) {
   return new DesktopWindowTreeHostWin(native_widget_delegate,
                                       desktop_native_widget_aura);
 }
 
 }  // namespace views