MSE: Start removing Blink-side support for LegacyFrameProcessor

public/platform/WebMediaSource.h

Index: public/platform/WebMediaSource.h
diff --git a/public/platform/WebMediaSource.h b/public/platform/WebMediaSource.h
index 702ba4c145612fdcaeae0769d28ed6a088b58d71..3d57563712faffc2121048dbc23e89c0a94c1de2 100644
--- a/public/platform/WebMediaSource.h
+++ b/public/platform/WebMediaSource.h
@@ -31,6 +31,7 @@
 #ifndef WebMediaSource_h
 #define WebMediaSource_h
 
+#include "WebCommon.h"
 #include "WebTimeRange.h"
 #include "WebURL.h"
 
@@ -58,7 +59,21 @@ public:
     };
 
     virtual ~WebMediaSource() { }
-    virtual AddStatus addSourceBuffer(const WebString& type, const WebVector<WebString>& codecs, const FrameProcessorChoice, WebSourceBuffer**) = 0;
+    // FIXME: Remove addSourceBuffer() that has FrameProcessorChoice, and remove
+    // the default implementations for addSourceBuffer() once Chromium
+    // implementation of the addSourceBuffer() with no FrameProcessorChoice has
+    // landed. See http://crbug.com/249422.
+    virtual AddStatus addSourceBuffer(const WebString& type, const WebVector<WebString>& codecs, const FrameProcessorChoice, WebSourceBuffer** webSourceBuffer)
+    {
+        // This default implementation should never be called for real.
+        BLINK_ASSERT_NOT_REACHED();
+        return AddStatusReachedIdLimit;
+    }
+    virtual AddStatus addSourceBuffer(const WebString& type, const WebVector<WebString>& codecs, WebSourceBuffer** webSourceBuffer)
+    {
+        return addSourceBuffer(type, codecs, WebMediaSource::UseNewFrameProcessor, webSourceBuffer);
+    }
+
     virtual double duration() = 0;
     virtual void setDuration(double) = 0;
     virtual void markEndOfStream(EndOfStreamStatus) = 0;