Implement HTMLMediaElement::srcObject.

Source/core/html/MediaProvider.h

Index: Source/core/html/MediaProvider.h
diff --git a/Source/platform/mediastream/RTCStatsRequest.h b/Source/core/html/MediaProvider.h
similarity index 70%
copy from Source/platform/mediastream/RTCStatsRequest.h
copy to Source/core/html/MediaProvider.h
index c397f90ab7ec90a65a7a5312bdd250e527eea561..aa566ba36496b5e79c69911ca1c263aae793b003 100644
--- a/Source/platform/mediastream/RTCStatsRequest.h
+++ b/Source/core/html/MediaProvider.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2012 Google Inc. All rights reserved.
+ * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -28,34 +28,36 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef RTCStatsRequest_h
-#define RTCStatsRequest_h
+#ifndef MediaProvider_h
+#define MediaProvider_h
 
 #include "platform/heap/Handle.h"
-#include "wtf/PassRefPtr.h"
-#include "wtf/text/WTFString.h"
+#include "wtf/Assertions.h"
 
 namespace blink {
 
-class MediaStreamComponent;
-class MediaStreamDescriptor;
-class RTCStatsResponseBase;
+class EventTarget;
+class MediaProvider;
+class ScriptValue;
 
-class RTCStatsRequest : public GarbageCollectedFinalized<RTCStatsRequest> {
+class MediaProviderConverter {
 public:
-    virtual ~RTCStatsRequest() { }
-
-    virtual RTCStatsResponseBase* createResponse() = 0;
-    virtual bool hasSelector() = 0;
-    virtual MediaStreamComponent* component() = 0;
-    virtual void requestSucceeded(RTCStatsResponseBase*) = 0;
+    MediaProviderConverter();
+    virtual MediaProvider* getMediaProvider(const ScriptValue&) = 0;

[perkj_chrome, 2014/09/11 17:31:45]

Is there some type of function pointers in blink I can use instead
MediProviderConverter? Ie, each module must register only one converter method
so all I need is a registry of static converter functions. 

[philipj_slow, 2014/09/11 19:07:53]

I haven't looked at any of the code yet, but it sounds like
Source/wtf/Functional.h may be relevant. For example Scheduler.h has a typedef
Function<void(double allottedTimeMs)> IdleTask;

It's not used that much in the code base, I'm not sure why that is.

+    static MediaProvider* convert(const ScriptValue&);
+protected:
+    virtual ~MediaProviderConverter() { }
+};
 
-    virtual void trace(Visitor*) { }
+class MediaProvider : public WillBeGarbageCollectedMixin {
+public:
+    MediaProvider(RawPtr<MediaProviderConverter>);
+    virtual ~MediaProvider() { };
 
-protected:
-    RTCStatsRequest() { }
+    virtual EventTarget* eventTarget() = 0;
+    virtual const String& getObjectUrl() = 0;
 };
 
 } // namespace blink
 
-#endif // RTCStatsRequest_h
+#endif