Add SourceBuffer implementations of Audio/VideoTracks

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

Index: third_party/WebKit/Source/modules/mediasource/VideoTrackSourceBuffer.cpp
diff --git a/third_party/WebKit/Source/modules/mediasource/VideoTrackSourceBuffer.cpp b/third_party/WebKit/Source/modules/mediasource/VideoTrackSourceBuffer.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..a0502aa810479a7c55f2461b00ebb5e6eb3c7bd3
--- /dev/null
+++ b/third_party/WebKit/Source/modules/mediasource/VideoTrackSourceBuffer.cpp
@@ -0,0 +1,17 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "modules/mediasource/VideoTrackSourceBuffer.h"
+
+#include "core/html/track/VideoTrack.h"
+
+namespace blink {
+
+VideoTrackSourceBuffer::VideoTrackSourceBuffer(VideoTrack& track, SourceBuffer* sourceBuffer)
+    : SourceBufferTrackBaseSupplement(track, sourceBuffer)
+{
+}
+
+} // namespace blink
+