Show the Cast toolbar icon ephemerally when Cast is in use

chrome/browser/ui/toolbar/component_toolbar_actions_factory.h

Index: chrome/browser/ui/toolbar/component_toolbar_actions_factory.h
diff --git a/chrome/browser/ui/toolbar/component_toolbar_actions_factory.h b/chrome/browser/ui/toolbar/component_toolbar_actions_factory.h
index 3f00ca9c1d0f53b37bf12b5b59da8bfb5deabfdb..cfe5fada2f42532902702448bb053260d8d094b6 100644
--- a/chrome/browser/ui/toolbar/component_toolbar_actions_factory.h
+++ b/chrome/browser/ui/toolbar/component_toolbar_actions_factory.h
@@ -56,6 +56,9 @@ class ComponentToolbarActionsFactory {
   // Ownership remains with the caller.
   static void SetTestingFactory(ComponentToolbarActionsFactory* factory);
 
+  // Returns whether the given ID belongs to a component action.
+  static bool IsComponentActionId(const std::string& id);

[Devlin, 2016/08/02 20:18:51]

Is this used?

[takumif, 2016/08/03 22:03:50]

No. Removing.

+
  private:
   DISALLOW_COPY_AND_ASSIGN(ComponentToolbarActionsFactory);
 };