[Media Router] Check MediaRouterDialogControllerImpl only sets toolbar MediaRouterAction.

chrome/browser/ui/toolbar/media_router_action.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_TOOLBAR_MEDIA_ROUTER_ACTION_H_
 #define CHROME_BROWSER_UI_TOOLBAR_MEDIA_ROUTER_ACTION_H_
 
 #include "base/scoped_observer.h"
 #include "chrome/browser/media/router/issues_observer.h"
 #include "chrome/browser/media/router/local_media_routes_observer.h"
 #include "chrome/browser/ui/tabs/tab_strip_model_observer.h"
 #include "chrome/browser/ui/toolbar/media_router_contextual_menu.h"
 #include "chrome/browser/ui/toolbar/toolbar_action_view_controller.h"
+#include "chrome/browser/ui/toolbar/toolbar_actions_bar.h"
 
 class Browser;
 class MediaRouterActionPlatformDelegate;
 class TabStripModel;
 
 namespace media_router {
 class MediaRouterDialogControllerImpl;
 }  // namespace media_router
 
 // The class for the Media Router component action that will be shown in
 // the toolbar.
 class MediaRouterAction : public ToolbarActionViewController,
                           public media_router::IssuesObserver,
                           public media_router::LocalMediaRoutesObserver,
                           public TabStripModelObserver {
  public:
-  explicit MediaRouterAction(Browser* browser);
+  MediaRouterAction(Browser* browser, ToolbarActionsBar* toolbar_actions_bar);
   ~MediaRouterAction() override;
 
   // ToolbarActionViewController implementation.
   std::string GetId() const override;
   void SetDelegate(ToolbarActionViewDelegate* delegate) override;
   gfx::Image GetIcon(content::WebContents* web_contents,
                      const gfx::Size& size) override;
   base::string16 GetActionName() const override;
   base::string16 GetAccessibleName(content::WebContents* web_contents)
       const override;
@@ skipping 18 matching lines @@
   // ToolbarStripModelObserver:
   void ActiveTabChanged(content::WebContents* old_contents,
                         content::WebContents* new_contents,
                         int index,
                         int reason) override;
 
   void OnPopupHidden();
   void OnPopupShown();
 
  private:
+  // Called when a new browser window is opened, the user switches tabs in the
+  // browser window, or when |delegate_| is swapped out to be non-null and has
+  // a valid WebContents.
+  // This updates the pressed/unpressed state of the icon, which is different
+  // on a per-tab basis.
   void UpdatePopupState();
 
   // Returns a reference to the MediaRouterDialogControllerImpl associated with
   // |delegate_|'s current WebContents. Guaranteed to be non-null.
   // |delegate_| and its current WebContents must not be null.
   // Marked virtual for tests.
   virtual media_router::MediaRouterDialogControllerImpl*
       GetMediaRouterDialogController();
 
   // Overridden by tests.
@@ skipping 23 matching lines @@
   // The current issue shown in the Media Router WebUI. Can be null. It is set
   // in OnIssueUpdated(), which is called by the IssueManager.
   scoped_ptr<media_router::Issue> issue_;
 
   // Whether a local displayable active route exists.
   bool has_local_display_route_;
 
   ToolbarActionViewDelegate* delegate_;
 
   Browser* const browser_;
+  ToolbarActionsBar* const toolbar_actions_bar_;
 
   // The delegate to handle platform-specific implementations.
   scoped_ptr<MediaRouterActionPlatformDelegate> platform_delegate_;
 
   MediaRouterContextualMenu contextual_menu_;
 
   ScopedObserver<TabStripModel, TabStripModelObserver>
       tab_strip_model_observer_;
 
   base::WeakPtrFactory<MediaRouterAction> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaRouterAction);
 };
 
 #endif  // CHROME_BROWSER_UI_TOOLBAR_MEDIA_ROUTER_ACTION_H_