Added notion of currently active app / browser

ash/launcher/launcher.h

Index: ash/launcher/launcher.h
diff --git a/ash/launcher/launcher.h b/ash/launcher/launcher.h
index dea112cae95de680648e46a18c2574e4dc66950e..9650110c74952fbd081faf18406f92ccd76c2073 100644
--- a/ash/launcher/launcher.h
+++ b/ash/launcher/launcher.h
@@ -22,6 +22,7 @@ namespace ash {
 
 namespace internal {
 class FocusCycler;
+class LauncherView;
 }
 
 class LauncherDelegate;
@@ -39,6 +40,9 @@ class ASH_EXPORT Launcher {
   void SetStatusWidth(int width);
   int GetStatusWidth();
 
+  // Only to be called for testing. Retrieves the LauncherView.
+  internal::LauncherView* GetLauncherViewForTest();
+
   LauncherDelegate* delegate() { return delegate_.get(); }
 
   LauncherModel* model() { return model_.get(); }
@@ -63,6 +67,9 @@ class ASH_EXPORT Launcher {
   // Contents view of the widget. Houses the LauncherView.
   DelegateView* delegate_view_;
 
+  // LauncherView used to display icons.
+  internal::LauncherView* launcher_view_;
+
   scoped_ptr<LauncherDelegate> delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(Launcher);