Revert of Remove MediaStreamTrack.getSources().

content/renderer/media/user_media_client_impl.h

Index: content/renderer/media/user_media_client_impl.h
diff --git a/content/renderer/media/user_media_client_impl.h b/content/renderer/media/user_media_client_impl.h
index 83a247bdd9e9e7bfa6f5d6f21151d4872b7fd3b9..5f33c98fba5957abd480f290b115a8d41c8cdd43 100644
--- a/content/renderer/media/user_media_client_impl.h
+++ b/content/renderer/media/user_media_client_impl.h
@@ -24,6 +24,7 @@
 #include "services/service_manager/public/cpp/interface_provider.h"
 #include "third_party/WebKit/public/platform/WebMediaStream.h"
 #include "third_party/WebKit/public/platform/WebMediaStreamSource.h"
+#include "third_party/WebKit/public/platform/WebSourceInfo.h"
 #include "third_party/WebKit/public/platform/WebVector.h"
 #include "third_party/WebKit/public/web/WebMediaDeviceChangeObserver.h"
 #include "third_party/WebKit/public/web/WebMediaDevicesRequest.h"
@@ -66,6 +67,8 @@
       const blink::WebUserMediaRequest& user_media_request) override;
   void requestMediaDevices(
       const blink::WebMediaDevicesRequest& media_devices_request) override;
+  void requestSources(
+      const blink::WebMediaStreamTrackSourcesRequest& sources_request) override;
   void setMediaDeviceChangeObserver(
       const blink::WebMediaDeviceChangeObserver& observer) override;
 
@@ -117,6 +120,9 @@
   virtual void EnumerateDevicesSucceded(
       blink::WebMediaDevicesRequest* request,
       blink::WebVector<blink::WebMediaDeviceInfo>& devices);
+  virtual void EnumerateSourcesSucceded(
+      blink::WebMediaStreamTrackSourcesRequest* request,
+      blink::WebVector<blink::WebSourceInfo>& sources);
 
   // Creates a MediaStreamAudioSource/MediaStreamVideoSource objects.
   // These are virtual for test purposes.
@@ -228,6 +234,8 @@
   using EnumerationResult = std::vector<std::vector<MediaDeviceInfo>>;
   void FinalizeEnumerateDevices(blink::WebMediaDevicesRequest request,
                                 const EnumerationResult& result);
+  void FinalizeGetSources(blink::WebMediaStreamTrackSourcesRequest request,
+                          const EnumerationResult& result);
 
   void DeleteAllUserMediaRequests();