Adding overview / layer framework to Activities so that unloaded / sleeping activities can be shown…

athena/test/sample_activity.cc

Index: athena/test/sample_activity.cc
diff --git a/athena/test/sample_activity.cc b/athena/test/sample_activity.cc
index a77e194b9bb12d470f3046fd1e1a6dd9867d4ed4..849671e25c1aed226e465169f17a6205c5ecf57a 100644
--- a/athena/test/sample_activity.cc
+++ b/athena/test/sample_activity.cc
@@ -81,9 +81,6 @@ views::Widget* SampleActivity::CreateWidget() {
   return NULL;
 }
 
-void SampleActivity::CreateOverviewModeImage() {
-}
-
 gfx::ImageSkia SampleActivity::GetOverviewModeImage() {
   return gfx::ImageSkia();
 }