cros: allow aura window not considered activatable for pointer event

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 bcfab7f07854d67c7c44d4517d03e44d6747643a..7470954b0fb854a9a5b6eb530dd0811ce168e79d 100644
--- a/ui/aura/client/aura_constants.h
+++ b/ui/aura/client/aura_constants.h
@@ -36,6 +36,9 @@ enum class WindowEmbedType {
 AURA_EXPORT extern const WindowProperty<bool>* const
     kAccessibilityFocusFallsbackToWidgetKey;
 
+// A property key to store whether activation on mouse click is enabled or not.
+AURA_EXPORT extern const WindowProperty<bool>* const kActivateOnClickKey;

[sky, 2017/04/12 19:49:16]

I prefer the property here. That way clients don't need to use ash directly.
Remember that for mus+ash only ash will use the code in src/ash, clients can use
src/ash/public, but not files such as src/ash/wm/ash_focus_rules.h

[Qiang(Joe) Xu, 2017/04/12 23:00:41]

Done.

+
 // A property key to store always-on-top flag.
 AURA_EXPORT extern const WindowProperty<bool>* const kAlwaysOnTopKey;