Add srcObject attribute of type MediaStream to HTMLMediaElement.

third_party/WebKit/public/platform/WebMediaPlayerSource.h

Index: third_party/WebKit/public/platform/WebMediaPlayerSource.h
diff --git a/third_party/WebKit/public/platform/WebMediaPlayerSource.h b/third_party/WebKit/public/platform/WebMediaPlayerSource.h
new file mode 100644
index 0000000000000000000000000000000000000000..2343e91247e2f9c5738d6d644197097f67943108
--- /dev/null
+++ b/third_party/WebKit/public/platform/WebMediaPlayerSource.h
@@ -0,0 +1,38 @@
+// 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.
+
+#ifndef WebMediaPlayerSource_h
+#define WebMediaPlayerSource_h
+
+#include "WebCommon.h"
+#include "WebMediaStream.h"
+#include "WebURL.h"
+
+namespace blink {
+
+class BLINK_PLATFORM_EXPORT WebMediaPlayerSource {
+public:
+    WebMediaPlayerSource();
+    explicit WebMediaPlayerSource(const WebURL&);
+    explicit WebMediaPlayerSource(const WebMediaStream&);
+    ~WebMediaPlayerSource();
+
+    bool isEmpty() const;
+
+    bool isURL() const;
+    WebURL getAsURL() const;
+
+    bool isMediaProviderObject() const;
+
+    bool isMediaStream() const;
+    WebMediaStream getAsMediaStream() const;
+
+private:
+    WebURL m_url;
+    WebMediaStream m_mediaStream;
+};
+
+} // namespace blink
+
+#endif // WebMediaPlayerSource_h