Implement getMediaDevices.

content/renderer/media/media_stream_impl.h

Index: content/renderer/media/media_stream_impl.h
diff --git a/content/renderer/media/media_stream_impl.h b/content/renderer/media/media_stream_impl.h
index 4d57e3d924c26a3fa701b196139fc0ec5cd106d7..c2403ae984feeb5cb980880b28c475f5d6f53431 100644
--- a/content/renderer/media/media_stream_impl.h
+++ b/content/renderer/media/media_stream_impl.h
@@ -23,6 +23,7 @@
 #include "third_party/WebKit/public/platform/WebMediaStream.h"
 #include "third_party/WebKit/public/platform/WebMediaStreamSource.h"
 #include "third_party/WebKit/public/platform/WebVector.h"
+#include "third_party/WebKit/public/web/WebMediaDevicesRequest.h"
 #include "third_party/WebKit/public/web/WebUserMediaClient.h"
 #include "third_party/WebKit/public/web/WebUserMediaRequest.h"
 #include "third_party/libjingle/source/talk/app/webrtc/mediastreaminterface.h"
@@ -61,6 +62,10 @@ class CONTENT_EXPORT MediaStreamImpl
       const blink::WebUserMediaRequest& user_media_request) OVERRIDE;
   virtual void cancelUserMediaRequest(
       const blink::WebUserMediaRequest& user_media_request) OVERRIDE;
+  virtual void requestMediaDevices(
+      const blink::WebMediaDevicesRequest& media_devices_request) OVERRIDE;
+  virtual void cancelMediaDevicesRequest(
+      const blink::WebMediaDevicesRequest& media_devices_request) OVERRIDE;
 
   // MediaStreamClient implementation.
   virtual bool IsMediaStream(const GURL& url) OVERRIDE;
@@ -184,6 +189,9 @@ class CONTENT_EXPORT MediaStreamImpl
   };
   typedef std::vector<LocalStreamSource> LocalStreamSources;
 
+  struct MediaDevicesRequestInfo;
+  typedef ScopedVector<MediaDevicesRequestInfo> MediaDevicesRequests;
+
   // Creates a WebKit representation of stream sources based on
   // |devices| from the MediaStreamDispatcher.
   void InitializeSourceObject(
@@ -216,6 +224,11 @@ class CONTENT_EXPORT MediaStreamImpl
       const blink::WebUserMediaRequest& request);
   void DeleteUserMediaRequestInfo(UserMediaRequestInfo* request);
 
+  MediaDevicesRequestInfo* FindMediaDevicesRequestInfo(int request_id);
+  MediaDevicesRequestInfo* FindMediaDevicesRequestInfo(
+      const blink::WebMediaDevicesRequest& request);
+  void DeleteMediaDevicesRequestInfo(MediaDevicesRequestInfo* request);
+
   // Returns the source that use a device with |device.session_id|
   // and |device.device.id|. NULL if such source doesn't exist.
   const blink::WebMediaStreamSource* FindLocalSource(
@@ -254,6 +267,9 @@ class CONTENT_EXPORT MediaStreamImpl
 
   UserMediaRequests user_media_requests_;
 
+  // Requests to enumerate media devices.
+  MediaDevicesRequests media_devices_requests_;
+
   DISALLOW_COPY_AND_ASSIGN(MediaStreamImpl);
 };