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

athena/content/app_activity.cc

Index: athena/content/app_activity.cc
diff --git a/athena/content/app_activity.cc b/athena/content/app_activity.cc
index e557b619514f1d72a68b4990b2095a8374793dce..8768681a3374910d58ffb44041d7893722a3b322 100644
--- a/athena/content/app_activity.cc
+++ b/athena/content/app_activity.cc
@@ -107,6 +107,10 @@ base::string16 AppActivity::GetTitle() const {
   return web_view_->GetWebContents()->GetTitle();
 }
 
+gfx::ImageSkia AppActivity::GetIcon() const {
+  return gfx::ImageSkia();
+}
+
 bool AppActivity::UsesFrame() const {
   return false;
 }