Make activities have a thick border when in overview mode part 1

athena/content/app_activity_proxy.cc

Index: athena/content/app_activity_proxy.cc
diff --git a/athena/content/app_activity_proxy.cc b/athena/content/app_activity_proxy.cc
index c0dbf080fe50c645f8df5a7b6a0dd25167faaee4..78437e02b9989bbbdaa9a6ee86e89b4805fdb2bb 100644
--- a/athena/content/app_activity_proxy.cc
+++ b/athena/content/app_activity_proxy.cc
@@ -73,6 +73,12 @@ views::View* AppActivityProxy::GetContentsView() {
   return view_;
 }
 
+void AppActivityProxy::PrepareContentsForOverview() {
+}
+
+void AppActivityProxy::ResetContentsView() {
+}
+
 void AppActivityProxy::CreateOverviewModeImage() {
   // Nothing we can do here.
 }