Refactor: Make MediaCaptureDevicesDispatcher have pluggable handlers.

chrome/browser/media/media_capture_devices_dispatcher.h

 // Copyright (c) 2012 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_MEDIA_CAPTURE_DEVICES_DISPATCHER_H_
 #define CHROME_BROWSER_MEDIA_MEDIA_CAPTURE_DEVICES_DISPATCHER_H_
 
 #include <deque>
 #include <list>
 #include <map>
 
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/scoped_vector.h"
 #include "base/memory/singleton.h"
 #include "base/observer_list.h"
 #include "content/public/browser/media_observer.h"
-#include "content/public/browser/notification_observer.h"
-#include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/web_contents_delegate.h"
 #include "content/public/common/media_stream_request.h"
 
 class DesktopStreamsRegistry;
+class MediaAccessHandler;
 class MediaStreamCaptureIndicator;
 class Profile;
 
 namespace extensions {
 class Extension;
 }
 
 namespace user_prefs {
 class PrefRegistrySyncable;
 }
 
 // This singleton is used to receive updates about media events from the content
 // layer.
-class MediaCaptureDevicesDispatcher : public content::MediaObserver,
-                                      public content::NotificationObserver {
+class MediaCaptureDevicesDispatcher : public content::MediaObserver {
  public:
   class Observer {
    public:
     // Handle an information update consisting of a up-to-date audio capture
     // device lists. This happens when a microphone is plugged in or unplugged.
     virtual void OnUpdateAudioDevices(
         const content::MediaStreamDevices& devices) {}
 
     // Handle an information update consisting of a up-to-date video capture
     // device lists. This happens when a camera is plugged in or unplugged.
@@ skipping 12 matching lines @@
                                        int render_frame_id) {}
 
     virtual ~Observer() {}
   };
 
   static MediaCaptureDevicesDispatcher* GetInstance();
 
   // Registers the preferences related to Media Stream default devices.
   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
 
+  // Returns true if the security origin is associated with casting.
+  static bool IsOriginForCasting(const GURL& origin);
+
   // Methods for observers. Called on UI thread.
   // Observers should add themselves on construction and remove themselves
   // on destruction.
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
   const content::MediaStreamDevices& GetAudioCaptureDevices();
   const content::MediaStreamDevices& GetVideoCaptureDevices();
 
   // Method called from WebCapturerDelegate implementations to process access
   // requests. |extension| is set to NULL if request was made from a drive-by
   // page.
   void ProcessMediaAccessRequest(
       content::WebContents* web_contents,
       const content::MediaStreamRequest& request,
       const content::MediaResponseCallback& callback,
       const extensions::Extension* extension);
 
   // Method called from WebCapturerDelegate implementations to check media
   // access permission. Note that this does not query the user.
   bool CheckMediaAccessPermission(content::WebContents* web_contents,
                                   const GURL& security_origin,
                                   content::MediaStreamType type);
 
   // Same as above but for an |extension|, which may not be NULL.
-#if defined(ENABLE_EXTENSIONS)
   bool CheckMediaAccessPermission(content::WebContents* web_contents,
                                   const GURL& security_origin,
                                   content::MediaStreamType type,
                                   const extensions::Extension* extension);
-#endif
 
   // Helper to get the default devices which can be used by the media request.
   // Uses the first available devices if the default devices are not available.
   // If the return list is empty, it means there is no available device on the
   // OS.
   // Called on the UI thread.
   void GetDefaultDevicesForProfile(Profile* profile,
                                    bool audio,
                                    bool video,
                                    content::MediaStreamDevices* devices);
@@ skipping 33 matching lines @@
 
   bool IsDesktopCaptureInProgress();
 
   // Only for testing.
   void SetTestAudioCaptureDevices(const content::MediaStreamDevices& devices);
   void SetTestVideoCaptureDevices(const content::MediaStreamDevices& devices);
 
  private:
   friend struct DefaultSingletonTraits<MediaCaptureDevicesDispatcher>;
 
-  struct PendingAccessRequest {
-    PendingAccessRequest(const content::MediaStreamRequest& request,
-                         const content::MediaResponseCallback& callback);
-    ~PendingAccessRequest();
-
-    // TODO(gbillock): make the MediaStreamDevicesController owned by
-    // this object when we're using bubbles.
-    content::MediaStreamRequest request;
-    content::MediaResponseCallback callback;
-  };
-  typedef std::deque<PendingAccessRequest> RequestsQueue;
-  typedef std::map<content::WebContents*, RequestsQueue> RequestsQueues;
-
   MediaCaptureDevicesDispatcher();
   ~MediaCaptureDevicesDispatcher() override;
 
-  // content::NotificationObserver implementation.
-  void Observe(int type,
-               const content::NotificationSource& source,
-               const content::NotificationDetails& details) override;
-
-  // Helpers for ProcessMediaAccessRequest().
-  void ProcessDesktopCaptureAccessRequest(
-      content::WebContents* web_contents,
-      const content::MediaStreamRequest& request,
-      const content::MediaResponseCallback& callback,
-      const extensions::Extension* extension);
-  void ProcessScreenCaptureAccessRequest(
-      content::WebContents* web_contents,
-      const content::MediaStreamRequest& request,
-      const content::MediaResponseCallback& callback,
-      const extensions::Extension* extension);
-  void ProcessTabCaptureAccessRequest(
-      content::WebContents* web_contents,
-      const content::MediaStreamRequest& request,
-      const content::MediaResponseCallback& callback,
-      const extensions::Extension* extension);
-#if defined(ENABLE_EXTENSIONS)
-  void ProcessMediaAccessRequestFromPlatformAppOrExtension(
-      content::WebContents* web_contents,
-      const content::MediaStreamRequest& request,
-      const content::MediaResponseCallback& callback,
-      const extensions::Extension* extension);
-#endif
-  void ProcessRegularMediaAccessRequest(
-      content::WebContents* web_contents,
-      const content::MediaStreamRequest& request,
-      const content::MediaResponseCallback& callback);
-  void ProcessQueuedAccessRequest(content::WebContents* web_contents);
-  void OnAccessRequestResponse(content::WebContents* web_contents,
-                               const content::MediaStreamDevices& devices,
-                               content::MediaStreamRequestResult result,
-                               scoped_ptr<content::MediaStreamUI> ui);
-
   // Called by the MediaObserver() functions, executed on UI thread.
   void NotifyAudioDevicesChangedOnUIThread();
   void NotifyVideoDevicesChangedOnUIThread();
   void UpdateMediaRequestStateOnUIThread(
       int render_process_id,
       int render_frame_id,
       int page_request_id,
       const GURL& security_origin,
       content::MediaStreamType stream_type,
       content::MediaRequestState state);
   void OnCreatingAudioStreamOnUIThread(int render_process_id,
                                        int render_frame_id);
 
   // Only for testing, a list of cached audio capture devices.
   content::MediaStreamDevices test_audio_devices_;
 
   // Only for testing, a list of cached video capture devices.
   content::MediaStreamDevices test_video_devices_;
 
   // A list of observers for the device update notifications.
   base::ObserverList<Observer> observers_;
 
   // Flag used by unittests to disable device enumeration.
   bool is_device_enumeration_disabled_;
 
-  RequestsQueues pending_requests_;
-
   scoped_refptr<MediaStreamCaptureIndicator> media_stream_capture_indicator_;
 
   scoped_ptr<DesktopStreamsRegistry> desktop_streams_registry_;
 
-  content::NotificationRegistrar notifications_registrar_;
-
-  // Tracks MEDIA_DESKTOP_VIDEO_CAPTURE sessions which reach the
-  // MEDIA_REQUEST_STATE_DONE state.  Sessions are remove when
-  // MEDIA_REQUEST_STATE_CLOSING is encountered.
-  struct DesktopCaptureSession {
-    int render_process_id;
-    int render_frame_id;
-    int page_request_id;
-  };
-  typedef std::list<DesktopCaptureSession> DesktopCaptureSessions;
-  DesktopCaptureSessions desktop_capture_sessions_;
+  // Handlers for processing media access requests.
+  ScopedVector<MediaAccessHandler> media_access_handlers_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaCaptureDevicesDispatcher);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_MEDIA_CAPTURE_DEVICES_DISPATCHER_H_