Additions to Activities to allow resource management

athena/content/app_activity.h

Index: athena/content/app_activity.h
diff --git a/athena/content/app_activity.h b/athena/content/app_activity.h
index 6c5a7422e7af3bea50a3534ea10d723f138dcbb0..620daa06817f13fea9f47f34559df34510f6d46b 100644
--- a/athena/content/app_activity.h
+++ b/athena/content/app_activity.h
@@ -29,12 +29,16 @@ class AppActivity : public Activity,
  protected:
   // Activity:
   virtual athena::ActivityViewModel* GetActivityViewModel() OVERRIDE;
+  virtual void SetCurrentState(ActivityStateTransition state) OVERRIDE;
+  virtual ActivityState GetCurrentState() OVERRIDE;
 
   // ActivityViewModel:
   virtual void Init() OVERRIDE;
   virtual SkColor GetRepresentativeColor() OVERRIDE;
   virtual base::string16 GetTitle() OVERRIDE;
   virtual views::View* GetContentsView() OVERRIDE;
+  virtual void CreateOverviewModeImage() OVERRIDE;
+  virtual const gfx::ImageSkia GetOverviewModeImage() OVERRIDE;
 
   // content::WebContentsObserver:
   virtual void TitleWasSet(content::NavigationEntry* entry,
@@ -46,6 +50,12 @@ class AppActivity : public Activity,
   scoped_ptr<apps::ShellAppWindow> app_window_;
   views::WebView* web_view_;
 
+  // The last requested state for this activity.
+  ActivityState last_requested_state_;
+
+  // The image which will be uded in overview mode.
+  gfx::ImageSkia overview_mode_image_;
+
   DISALLOW_COPY_AND_ASSIGN(AppActivity);
 };