Add TraySms for SMS messages.

ash/system/tray/tray_views.h

Index: ash/system/tray/tray_views.h
diff --git a/ash/system/tray/tray_views.h b/ash/system/tray/tray_views.h
index 440036d19d4e715af54a87e1bab79dbc89051258..7a6f180d081d707605654ab32140d0b8296c1fe9 100644
--- a/ash/system/tray/tray_views.h
+++ b/ash/system/tray/tray_views.h
@@ -138,14 +138,17 @@ class FixedSizedScrollView : public views::ScrollView {
 
   void set_fixed_size(gfx::Size size) { fixed_size_ = size; }
 
- private:
-  // Overridden from views::View.
+  // views::View public method overrides.
   virtual gfx::Size GetPreferredSize() OVERRIDE;
   virtual void Layout() OVERRIDE;
-  virtual void OnBoundsChanged(const gfx::Rect& previous_bounds) OVERRIDE;
   virtual void OnMouseEntered(const views::MouseEvent& event) OVERRIDE;
+
+ protected:
+  // views::View protected method overrides.
+  virtual void OnBoundsChanged(const gfx::Rect& previous_bounds) OVERRIDE;
   virtual void OnPaintFocusBorder(gfx::Canvas* canvas) OVERRIDE;
 
+ private:
   gfx::Size fixed_size_;
 
   DISALLOW_COPY_AND_ASSIGN(FixedSizedScrollView);