chrome://media-internals: update MediaInternals when devices capabilities are enumerated.

content/browser/media/media_internals.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 CONTENT_BROWSER_MEDIA_MEDIA_INTERNALS_H_
 #define CONTENT_BROWSER_MEDIA_MEDIA_INTERNALS_H_
 
 #include <string>
 #include <vector>
 
 #include "base/callback_forward.h"
 #include "base/compiler_specific.h"
 #include "base/lazy_instance.h"
 #include "base/strings/string16.h"
 #include "base/synchronization/lock.h"
 #include "base/values.h"
 #include "content/common/content_export.h"
 #include "media/audio/audio_logging.h"
+#include "media/video/capture/video_capture_device_info.h"
 
 namespace media {
 class AudioParameters;
 struct MediaLogEvent;
 }
 
 namespace content {
 
 // This class stores information about currently active media.
 class CONTENT_EXPORT MediaInternals
     : NON_EXPORTED_BASE(public media::AudioLogFactory) {
  public:
+  // Called with the update string.
+  typedef base::Callback<void(const base::string16&)> UpdateCallback;
+
   static MediaInternals* GetInstance();
 
   virtual ~MediaInternals();
 
   // Called when a MediaEvent occurs.
   void OnMediaEvents(int render_process_id,
                      const std::vector<media::MediaLogEvent>& events);
 
-  // Called with the update string.
-  typedef base::Callback<void(const base::string16&)> UpdateCallback;
-
   // Add/remove update callbacks (see above).  Must be called on the IO thread.
   void AddUpdateCallback(const UpdateCallback& callback);
   void RemoveUpdateCallback(const UpdateCallback& callback);
 
-  // Sends all cached data to each registered UpdateCallback.
-  void SendEverything();
+  // Sends all audio cached data to each registered UpdateCallback.
+  void SendAudioStreamData();
+
+  // Called to inform of the capabilities enumerated for a video device.

[wolenetz, 2014/10/09 20:51:43]

nit: s/video device/video capture device/
Also, is this for just one device, or multiple? If the latter, update comment
please.

[mcasas, 2014/10/10 11:30:41]

Done.

+  void UpdateVideoCaptureDeviceCapabilities(
+      const media::VideoCaptureDeviceInfos& name_and_formats);
 
   // AudioLogFactory implementation.  Safe to call from any thread.
   virtual scoped_ptr<media::AudioLog> CreateAudioLog(
       AudioComponent component) override;
 
  private:
   friend class AudioLogImpl;
   friend class MediaInternalsTest;
   friend struct base::DefaultLazyInstanceTraits<MediaInternals>;
 
   MediaInternals();
 
   // Sends |update| to each registered UpdateCallback.  Safe to call from any
   // thread, but will forward to the IO thread.
   void SendUpdate(const base::string16& update);
 
-  // Caches |value| under |cache_key| so that future SendEverything() calls will
-  // include the current data.  Calls JavaScript |function|(|value|) for each
-  // registered UpdateCallback.  SendUpdateAndPurgeCache() is similar but purges
-  // the cache entry after completion instead.
-  void SendUpdateAndCache(const std::string& cache_key,
-                          const std::string& function,
-                          const base::DictionaryValue* value);
-  void SendUpdateAndPurgeCache(const std::string& cache_key,
-                               const std::string& function,
-                               const base::DictionaryValue* value);
+  // Caches |value| under |cache_key| so that future SendAudioStreamData() calls
+  // will include the current data.  Calls JavaScript |function|(|value|) for
+  // each registered UpdateCallback.  SendUpdateAndPurgeCache() is similar but
+  // purges the cache entry after completion instead.
+  void SendUpdateAndCacheAudioStreamKey(const std::string& cache_key,
+                                        const std::string& function,
+                                        const base::DictionaryValue* value);
+  void SendUpdateAndPurgeAudioStreamCache(const std::string& cache_key,
+                                          const std::string& function,
+                                          const base::DictionaryValue* value);
+
   // Must only be accessed on the IO thread.
   std::vector<UpdateCallback> update_callbacks_;
 
   // All variables below must be accessed under |lock_|.
   base::Lock lock_;
-  base::DictionaryValue cached_data_;
+  base::DictionaryValue audio_streams_cached_data_;
   int owner_ids_[AUDIO_COMPONENT_MAX];
 
   DISALLOW_COPY_AND_ASSIGN(MediaInternals);
 };
 
 } // namespace content
 
 #endif  // CONTENT_BROWSER_MEDIA_MEDIA_INTERNALS_H_