cros: allow aura window not considered activatable for pointer event

ui/aura/client/aura_constants.h

 // 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.
 
 #ifndef UI_AURA_CLIENT_AURA_CONSTANTS_H_
 #define UI_AURA_CLIENT_AURA_CONSTANTS_H_
 
 #include <string>
 
 #include "base/strings/string16.h"
@@ skipping 18 matching lines @@
   TOP_LEVEL_IN_WM,
 };
 
 // Alphabetical sort.
 
 // A property key to store whether accessibility focus falls back to widget or
 // not.
 AURA_EXPORT extern const WindowProperty<bool>* const
     kAccessibilityFocusFallsbackToWidgetKey;
 
+// A property key to store whether activation on pointer event is enabled or
+// not.

[sky, 2017/04/17 16:08:48]

Document that default is true, which means windows are activated when a pointer
down event occurs on them.

[Qiang(Joe) Xu, 2017/04/17 17:40:32]

Done.

+AURA_EXPORT extern const WindowProperty<bool>* const kActivateOnPointerKey;
+
 // A property key to store always-on-top flag.
 AURA_EXPORT extern const WindowProperty<bool>* const kAlwaysOnTopKey;
 
 // A property key to store whether animations are disabled for the window. Type
 // of value is an int.
 AURA_EXPORT extern const WindowProperty<bool>* const kAnimationsDisabledKey;
 
 // A property key to store the app icon, typically larger for shelf icons, etc.
 AURA_EXPORT extern const WindowProperty<gfx::ImageSkia*>* const kAppIconKey;
 
@@ skipping 84 matching lines @@
 
 AURA_EXPORT extern const WindowProperty<ui::mojom::WindowType>* const
     kWindowTypeKey;
 
 // Alphabetical sort.
 
 }  // namespace client
 }  // namespace aura
 
 #endif  // UI_AURA_CLIENT_AURA_CONSTANTS_H_