Implement HTMLMediaElement::srcObject.

Source/core/html/MediaProvider.h

 /*
- * 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
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer
  *    in the documentation and/or other materials provided with the
  *    distribution.
  * 3. Neither the name of Google Inc. nor the names of its contributors
  *    may be used to endorse or promote products derived from this
  *    software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  * 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() { }
+    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 RTCStatsResponseBase* createResponse() = 0;
-    virtual bool hasSelector() = 0;
-    virtual MediaStreamComponent* component() = 0;
-    virtual void requestSucceeded(RTCStatsResponseBase*) = 0;
+class MediaProvider : public WillBeGarbageCollectedMixin {
+public:
+    MediaProvider(RawPtr<MediaProviderConverter>);
+    virtual ~MediaProvider() { };
 
-    virtual void trace(Visitor*) { }
-
-protected:
-    RTCStatsRequest() { }
+    virtual EventTarget* eventTarget() = 0;
+    virtual const String& getObjectUrl() = 0;
 };
 
 } // namespace blink
 
-#endif // RTCStatsRequest_h
+#endif