Interface for requestSources through UserMediaController/Client.

This allows MediaStreamTrack::getSources to go through UserMediaClient.

To land after this:
Chrome CL part 1: https://codereview.chromium.org/562643003/
Blink CL part 2: https://codereview.chromium.org/559423002
Chrome CL part 2 (TBD)

BUG=406094

Review URL: https://codereview.chromium.org/560843002

git-svn-id: svn://svn.chromium.org/blink/trunk@181822 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/modules/mediastream/UserMediaClient.h

@@ -33,6 +33,7 @@
 
 #include "modules/mediastream/MediaDevicesRequest.h"
 #include "modules/mediastream/UserMediaRequest.h"
+#include "platform/mediastream/MediaStreamTrackSourcesRequest.h"
 
 namespace blink {
 
@@ -44,6 +45,7 @@ public:
     virtual void cancelUserMediaRequest(UserMediaRequest*) = 0;
     virtual void requestMediaDevices(MediaDevicesRequest*) = 0;
     virtual void cancelMediaDevicesRequest(MediaDevicesRequest*) = 0;
+    virtual void requestSources(MediaStreamTrackSourcesRequest*) = 0;
 
 protected:
     virtual ~UserMediaClient() { }

third_party/WebKit/Source/modules/mediastream/UserMediaController.h

@@ -47,6 +47,8 @@ public:
     void requestMediaDevices(MediaDevicesRequest*);
     void cancelMediaDevicesRequest(MediaDevicesRequest*);
 
+    void requestSources(MediaStreamTrackSourcesRequest*);
+
     static PassOwnPtrWillBeRawPtr<UserMediaController> create(UserMediaClient*);
     static const char* supplementName();
     static UserMediaController* from(LocalFrame* frame) { return static_cast<UserMediaController*>(WillBeHeapSupplement<LocalFrame>::from(frame, supplementName())); }
@@ -80,6 +82,11 @@ inline void UserMediaController::cancelMediaDevicesRequest(MediaDevicesRequest*
     m_client->cancelMediaDevicesRequest(request);
 }
 
+inline void UserMediaController::requestSources(MediaStreamTrackSourcesRequest* request)
+{
+    m_client->requestSources(request);
+}
+
 } // namespace blink
 
 #endif // UserMediaController_h

third_party/WebKit/Source/web/UserMediaClientImpl.cpp

@@ -31,6 +31,7 @@
 #include "config.h"
 #include "web/UserMediaClientImpl.h"
 
+#include "public/platform/WebMediaStreamTrackSourcesRequest.h"
 #include "public/web/WebFrameClient.h"
 #include "public/web/WebMediaDevicesRequest.h"
 #include "public/web/WebUserMediaClient.h"
@@ -69,4 +70,10 @@ void UserMediaClientImpl::cancelMediaDevicesRequest(MediaDevicesRequest* request
         m_client->cancelMediaDevicesRequest(WebMediaDevicesRequest(request));
 }
 
+void UserMediaClientImpl::requestSources(MediaStreamTrackSourcesRequest* request)
+{
+    if (m_client)
+        m_client->requestSources(request);
+}
+
 } // namespace blink

third_party/WebKit/Source/web/UserMediaClientImpl.h

@@ -50,6 +50,7 @@ public:
     virtual void cancelUserMediaRequest(UserMediaRequest*) OVERRIDE;
     virtual void requestMediaDevices(MediaDevicesRequest*) OVERRIDE;
     virtual void cancelMediaDevicesRequest(MediaDevicesRequest*) OVERRIDE;
+    virtual void requestSources(MediaStreamTrackSourcesRequest*) OVERRIDE;
 
 private:
     UserMediaClientImpl();

third_party/WebKit/public/web/WebUserMediaClient.h

@@ -34,6 +34,7 @@
 namespace blink {
 
 class WebMediaDevicesRequest;
+class WebMediaStreamTrackSourcesRequest;
 class WebUserMediaRequest;
 template <typename T> class WebVector;
 
@@ -45,6 +46,7 @@ public:
     virtual void cancelUserMediaRequest(const WebUserMediaRequest&) = 0;
     virtual void requestMediaDevices(const WebMediaDevicesRequest&) = 0;
     virtual void cancelMediaDevicesRequest(const WebMediaDevicesRequest&) = 0;
+    virtual void requestSources(const WebMediaStreamTrackSourcesRequest&) { };
 };
 
 } // namespace blink