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..3a89af074309285e7a76eda1cb6a5dde6ed65abb 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

[Devlin, 2016/07/29 19:10:22]

end in a '.'

[takumif, 2016/08/02 04:58:41]

Done.

+  static bool IsComponentActionId(const std::string& id);
+
  private:
   DISALLOW_COPY_AND_ASSIGN(ComponentToolbarActionsFactory);
 };