Add SourceBuffer implementations of Audio/VideoTracks

third_party/WebKit/Source/modules/mediasource/SourceBufferVideoTrack.cpp

Index: third_party/WebKit/Source/modules/mediasource/SourceBufferVideoTrack.cpp
diff --git a/third_party/WebKit/Source/core/svg/SVGDiscardElement.h b/third_party/WebKit/Source/modules/mediasource/SourceBufferVideoTrack.cpp
similarity index 59%
copy from third_party/WebKit/Source/core/svg/SVGDiscardElement.h
copy to third_party/WebKit/Source/modules/mediasource/SourceBufferVideoTrack.cpp
index 76b61d8cc55381b4fcaddc4303bdc5e3aee7c0be..2c5010fc3c548718c56876e8e907086c9a1fc036 100644
--- a/third_party/WebKit/Source/core/svg/SVGDiscardElement.h
+++ b/third_party/WebKit/Source/modules/mediasource/SourceBufferVideoTrack.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2014 Samsung Electronics. All rights reserved.
+ * Copyright (C) 2016 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
@@ -28,33 +28,49 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef SVGDiscardElement_h
-#define SVGDiscardElement_h
+#include "modules/mediasource/SourceBufferVideoTrack.h"
 
-#include "core/svg/animation/SVGSMILElement.h"
+#include "core/html/track/VideoTrack.h"
+#include "modules/mediasource/SourceBuffer.h"
 
 namespace blink {
 
-class SVGDiscardElement final : public SVGSMILElement {
-    DEFINE_WRAPPERTYPEINFO();
-public:
-    DECLARE_NODE_FACTORY(SVGDiscardElement);
+SourceBufferVideoTrack::SourceBufferVideoTrack(SourceBuffer* sourceBuffer)
+    : m_sourceBuffer(sourceBuffer)
+{
+}
 
-    bool isSVGDiscardElement() const override { return true; }
-private:
-    explicit SVGDiscardElement(Document&);
+SourceBufferVideoTrack::~SourceBufferVideoTrack()
+{
+}
 
-    void resetAnimatedType() override { }
-    void clearAnimatedType() override { }
-    void applyResultsToTarget() override { }
-    bool hasValidAttributeType() override;
-    bool hasValidAttributeName() override;
-    void animationAttributeChanged() override { }
+const char* SourceBufferVideoTrack::supplementName()
+{
+    return "SourceBufferVideoTrack";
+}
 
-    void startedActiveInterval() override { }
-    void updateAnimation(float percent, unsigned repeat, SVGSMILElement* resultElement) override { }
-};
+SourceBufferVideoTrack& SourceBufferVideoTrack::from(VideoTrack& track)
+{
+    SourceBufferVideoTrack* supplement = static_cast<SourceBufferVideoTrack*>(HeapSupplement<VideoTrack>::from(track, supplementName()));
+    if (!supplement) {
+        supplement = new SourceBufferVideoTrack(nullptr);
+        provideTo(track, supplementName(), supplement);
+    }
+    return *supplement;
+}
+
+// static
+SourceBuffer* SourceBufferVideoTrack::sourceBuffer(VideoTrack& track)
+{
+    return SourceBufferVideoTrack::from(track).m_sourceBuffer;
+}
+
+
+DEFINE_TRACE(SourceBufferVideoTrack)
+{
+    visitor->trace(m_sourceBuffer);
+    HeapSupplement<VideoTrack>::trace(visitor);
+}
 
 } // namespace blink
 
-#endif // SVGDiscardElement_h