Wiring metro mouse events to aura viewer

ui/base/events/event.h

Index: ui/base/events/event.h
===================================================================
--- ui/base/events/event.h	(revision 159567)
+++ ui/base/events/event.h	(working copy)
@@ -342,6 +342,8 @@
   // flags. Use this to determine the button that was pressed or released.
   int changed_button_flags() const { return changed_button_flags_; }
 
+  void set_changed_button_flags(int flags) { changed_button_flags_ = flags; }
+
  private:
   // Returns the repeat count based on the previous mouse click, if it is
   // recent enough and within a small enough distance.