Add ImeMenuTray element.

ui/aura/client/aura_constants.h

Index: ui/aura/client/aura_constants.h
diff --git a/ui/aura/client/aura_constants.h b/ui/aura/client/aura_constants.h
index 17523dabb889f18ec2ce2505e705761a036e28da..baf701418bb7b4a61269aaee5aee174af1859c72 100644
--- a/ui/aura/client/aura_constants.h
+++ b/ui/aura/client/aura_constants.h
@@ -45,6 +45,10 @@ AURA_EXPORT extern const aura::WindowProperty<bool>* const kDrawAttentionKey;
 // recently used windows list.
 AURA_EXPORT extern const aura::WindowProperty<bool>* const kExcludeFromMruKey;
 
+// A property key to indicate that a window icon should be shown on the tray
+// rather than shelf.
+AURA_EXPORT extern const aura::WindowProperty<bool>* const kShowIconOnTrayKey;
+

[sadrul, 2016/06/27 15:08:05]

This key should go somewhere in ash/shelf/, not in here.

[Azure Wei, 2016/06/27 18:33:49]

Moved to ash/shelf/shelf_util.* 

 // A property key to store the host window of a window. This lets
 // WebContentsViews find the windows that should constrain NPAPI plugins.
 AURA_EXPORT extern const WindowProperty<Window*>* const kHostWindowKey;