Adding application lifetime tests to athena, allowing to override focus request for applciations

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 143dd88af2c001f30f262606970a767512d2f47c..d6060a9429e5c124eaef5e6ec7ffc8fd8771ff10 100644
--- a/athena/content/app_activity_proxy.cc
+++ b/athena/content/app_activity_proxy.cc
@@ -21,7 +21,8 @@ AppActivityProxy::AppActivityProxy(AppActivity* replaced_activity,
     title_(replaced_activity->GetActivityViewModel()->GetTitle()),
     color_(replaced_activity->GetActivityViewModel()->GetRepresentativeColor()),
     replaced_activity_(replaced_activity),
-    view_(new views::View()) {
+    view_(new views::View()),
+    restart_called_(false) {
 }
 
 AppActivityProxy::~AppActivityProxy() {
@@ -33,9 +34,11 @@ ActivityViewModel* AppActivityProxy::GetActivityViewModel() {
 }
 
 void AppActivityProxy::SetCurrentState(ActivityState state) {
-  // We only restart the application when we are switching to visible.
-  if (state != ACTIVITY_VISIBLE)
+  // We only restart the application when we are switching to visible, and only
+  // once.
+  if (state != ACTIVITY_VISIBLE || restart_called_)
     return;
+  restart_called_ = true;
   app_activity_registry_->RestartApplication(this);
   // Note: This object is now destroyed.
 }