Show avatar icon on V2 app's frame

ash/frame/default_header_painter.h

Index: ash/frame/default_header_painter.h
diff --git a/ash/frame/default_header_painter.h b/ash/frame/default_header_painter.h
index 80990c143bdc3346ab05dba7a3c16370a0ad23ae..b664d59e3529d6cd41a55e78a0235edfdbbf7f3f 100644
--- a/ash/frame/default_header_painter.h
+++ b/ash/frame/default_header_painter.h
@@ -46,6 +46,9 @@ class ASH_EXPORT DefaultHeaderPainter : public HeaderPainter,
   virtual void SetHeaderHeightForPainting(int height) OVERRIDE;
   virtual void SchedulePaintForTitle() OVERRIDE;
 
+  // Sets the window icon for the header. Passing NULL removes the window icon.
+  void UpdateWindowIcon(views::View* window_icon, int icon_size);
+
  private:
   FRIEND_TEST_ALL_PREFIXES(DefaultHeaderPainterTest, TitleIconAlignment);
 
@@ -73,6 +76,7 @@ class ASH_EXPORT DefaultHeaderPainter : public HeaderPainter,
   views::Widget* frame_;
   views::View* view_;
   views::View* window_icon_;  // May be NULL.
+  int window_icon_size_;
   FrameCaptionButtonContainerView* caption_button_container_;
 
   // The height of the header including the header/content separator.