MSE: Allow requesting coded frame processor: legacy or new

public/platform/WebMediaSource.h

Index: public/platform/WebMediaSource.h
diff --git a/public/platform/WebMediaSource.h b/public/platform/WebMediaSource.h
index 1ba3be7f869fcbeb867bd88ffa4fe5f8381bffdc..eb12c1d618c95977e60164d61e418634232f40de 100644
--- a/public/platform/WebMediaSource.h
+++ b/public/platform/WebMediaSource.h
@@ -52,9 +52,26 @@ public:
         EndOfStreamStatusDecodeError,
     };
 
+    enum FrameProcessorChoice {
+        UseLegacyFrameProcessor,
+        UseNewFrameProcessor
+    };
+
     virtual ~WebMediaSource() { }
 
-    virtual AddStatus addSourceBuffer(const WebString& type, const WebVector<WebString>& codecs, WebSourceBuffer**) = 0;
+    // FIXME: Remove addSourceBuffer() that has no FrameProcessorChoice, and
+    // remove the default implementation for the addSourceBuffer() that has
+    // FrameProcessorChoice once the latter's Chromium implementation has
+    // landed. See http://crbug.com/249422.
+    virtual AddStatus addSourceBuffer(const WebString& type, const WebVector<WebString>& codecs, WebSourceBuffer** webSourceBuffer)
+    {
+        return addSourceBuffer(type, codecs, WebMediaSource::UseLegacyFrameProcessor, webSourceBuffer);
+    }
+    virtual AddStatus addSourceBuffer(const WebString& type, const WebVector<WebString>& codecs, const FrameProcessorChoice choice, WebSourceBuffer** webSourceBuffer)
+    {
+        return addSourceBuffer(type, codecs, webSourceBuffer);
+    }
+
     virtual double duration() = 0;
     virtual void setDuration(double) = 0;
     virtual void markEndOfStream(EndOfStreamStatus) = 0;