[MediaRouter] Moved the code useful for Android to MediaRouterDialogController

chrome/browser/media/router/media_router_dialog_controller.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_MEDIA_ROUTER_MEDIA_ROUTER_DIALOG_CONTROLLER_H_
 #define CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTER_DIALOG_CONTROLLER_H_
 
 #include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/threading/thread_checker.h"
 #include "chrome/browser/media/router/create_presentation_session_request.h"
+#include "content/public/browser/web_contents_observer.h"
 
 namespace content {
 class WebContents;
 }  // namespace content
 
 namespace media_router {
 
-// An implementation of this interface is tied to a WebContents known as the
-// initiator, and is lazily created when a Media Router dialog needs to be
-// shown. The MediaRouterDialogController allows creating, querying, and
-// removing a Media Router dialog modal to the initiator WebContents.
+// An abstract base class for Media Router dialog controllers. Tied to a
+// WebContents known as the |initiator|, and is lazily created when a Media
+// Router dialog needs to be shown. The MediaRouterDialogController allows
+// showing and closing a Media Router dialog modal to the initiator WebContents.
 // This class is not thread safe and must be called on the UI thread.
 class MediaRouterDialogController {
  public:
-  virtual ~MediaRouterDialogController() = default;
+  virtual ~MediaRouterDialogController();
 
   // Gets a reference to the MediaRouterDialogController associated with
   // |web_contents|, creating one if it does not exist. The returned pointer is
   // guaranteed to be non-null.
   static MediaRouterDialogController* GetOrCreateForWebContents(
       content::WebContents* web_contents);
 
-  // Creates a Media Router modal dialog using the initiator and parameters
-  // specified in |request|. If the dialog already exists, brings the dialog
-  // to the front, but does not change the dialog with |request|.
-  // Returns WebContents for the media router dialog if a dialog was created.
-  // Otherwise returns false and |request| is deleted.
-  virtual bool ShowMediaRouterDialogForPresentation(
-      scoped_ptr<CreatePresentationSessionRequest> request) = 0;
+  // Shows the media router dialog modal to |initiator_| and the parameters
+  // specified in |request|.
+  // Creates the dialog if it did not exist prior to this call, returns true.
+  // If the dialog already exists, brings it to the front but doesn't change the
+  // dialog with |request|, returns false and |request| is deleted.
+  bool ShowMediaRouterDialogForPresentation(
+      scoped_ptr<CreatePresentationSessionRequest> request);
+
+  // Shows the media router dialog modal to |initiator_|.
+  // Creates the dialog if it did not exist prior to this call, returns true.
+  // If the dialog already exists, brings it to the front, returns false.
+  virtual bool ShowMediaRouterDialog();
+
+  // Hides the media router dialog.
+  // It is a no-op to call this function if there is currently no dialog.
+  void HideMediaRouterDialog();
+
+ protected:
+  // Use MediaRouterDialogController::GetOrCreateForWebContents() to create an
+  // instance.
+  explicit MediaRouterDialogController(content::WebContents* initiator);
+
+  void ActivateInitiatorWebContents();
+
+  scoped_ptr<CreatePresentationSessionRequest> PassPresentationRequest();
+
+  content::WebContents* initiator() const { return initiator_; }
+
+  // Resets the state of the controller. Must be called from the overrides.
+  virtual void Reset();
+  // Creates a new media router dialog modal to |initiator_|.
+  virtual void CreateMediaRouterDialog() = 0;
+  // Closes the media router dialog if it exists.
+  virtual void CloseMediaRouterDialog() = 0;
+  // Indicates if the media router dialog already exists.
+  virtual bool IsShowingMediaRouterDialog() const = 0;
+
+  base::ThreadChecker thread_checker_;
+
+ private:
+  class InitiatorWebContentsObserver;
+
+  // An observer for the |initiator_| that closes the dialog when |initiator_|
+  // is destroyed or navigated.
+  scoped_ptr<InitiatorWebContentsObserver> initiator_observer_;
+  content::WebContents* const initiator_;
+
+  // Data for dialogs created at the request of the Presentation API.
+  // Passed from the caller via ShowMediaRouterDialogForPresentation to the
+  // dialog when it is initialized.
+  scoped_ptr<CreatePresentationSessionRequest> presentation_request_;
+
+  DISALLOW_COPY_AND_ASSIGN(MediaRouterDialogController);
 };
 
 }  // namespace media_router
 
 #endif  // CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTER_DIALOG_CONTROLLER_H_