[Athena] Hack to display favicons for web activities in overview mode

athena/activity/public/activity_view_model.h

Index: athena/activity/public/activity_view_model.h
diff --git a/athena/activity/public/activity_view_model.h b/athena/activity/public/activity_view_model.h
index 12b8ceda8e17324cca7489e6742273d0988cec22..6b1af692ef969c91fb9383ad9d9d63b2c324d4a6 100644
--- a/athena/activity/public/activity_view_model.h
+++ b/athena/activity/public/activity_view_model.h
@@ -37,6 +37,9 @@ class ATHENA_EXPORT ActivityViewModel {
   // Returns a title for the activity.
   virtual base::string16 GetTitle() const = 0;
 
+  // Returns an icon for the activity.
+  virtual gfx::ImageSkia GetIcon() const = 0;
+
   // True if the activity wants to use Widget's frame, or false if the activity
   // draws its own frame.
   virtual bool UsesFrame() const = 0;