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 7c052a56ce3da4bed13a9c3e7e978aa3cf57850e..0092edda847bc7c23048cdf3dae0bc9eaa30d197 100644
--- a/athena/test/sample_activity.cc
+++ b/athena/test/sample_activity.cc
@@ -73,9 +73,6 @@ views::View* SampleActivity::GetContentsView() {
   return contents_view_;
 }
 
-void SampleActivity::CreateOverviewModeImage() {
-}
-
 gfx::ImageSkia SampleActivity::GetOverviewModeImage() {
   return gfx::ImageSkia();
 }