MediaStream API: Changing the device enumeration to be async

public/platform/WebMediaStreamCenter.h

Index: public/platform/WebMediaStreamCenter.h
diff --git a/public/platform/WebMediaStreamCenter.h b/public/platform/WebMediaStreamCenter.h
index 8340a4e054dd941699734e4096a2ef5f7779f43d..87d2fcf8a9a3a6a81ec80b446a4f5850408adcc2 100644
--- a/public/platform/WebMediaStreamCenter.h
+++ b/public/platform/WebMediaStreamCenter.h
@@ -37,6 +37,7 @@ namespace WebKit {
 class WebMediaStream;
 class WebMediaStreamSourcesRequest;
 class WebMediaStreamTrack;
+class WebMediaStreamTrackSourcesRequest;
 class WebSourceInfo;
 class WebString;
 
@@ -45,7 +46,7 @@ public:
     virtual ~WebMediaStreamCenter() { }
 
     virtual void queryMediaStreamSources(const WebMediaStreamSourcesRequest&) = 0;
-    virtual bool getSourceInfos(const WebString& url, WebVector<WebSourceInfo>&) { return false; }
+    virtual bool getMediaStreamTrackSources(const WebMediaStreamTrackSourcesRequest&) { return false; }
     virtual void didEnableMediaStreamTrack(const WebMediaStream&, const WebMediaStreamTrack&) = 0;
     virtual void didDisableMediaStreamTrack(const WebMediaStream&, const WebMediaStreamTrack&) = 0;
     virtual bool didAddMediaStreamTrack(const WebMediaStream&, const WebMediaStreamTrack&) { return false; };