Basic use implementation for MediaStream from Canvas: captureStream()

third_party/WebKit/public/platform/WebCanvasCaptureHandler.h

Index: third_party/WebKit/public/platform/WebCanvasCaptureHandler.h
diff --git a/third_party/WebKit/public/platform/WebCanvasCaptureHandler.h b/third_party/WebKit/public/platform/WebCanvasCaptureHandler.h
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index 0000000000000000000000000000000000000000..421ab37b562274f0284dde775c737a1b226ddc99
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+++ b/third_party/WebKit/public/platform/WebCanvasCaptureHandler.h
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+// Copyright 2015 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 WebCanvasCaptureHandler_h
+#define WebCanvasCaptureHandler_h
+
+#include "WebCommon.h"
+#include "public/platform/WebSkImage.h"
+
+namespace blink {
+
+class WebSkImage;
+
+// Platform interface of a CanvasCaptureHandler.
+class BLINK_PLATFORM_EXPORT WebCanvasCaptureHandler {
+public:
+    virtual ~WebCanvasCaptureHandler() = default;
+    virtual void sendNewFrame(const WebSkImage& image) {}
+    virtual bool needsNewFrame() const { return false; }
+};
+
+} // namespace blink
+
+#endif // WebMediaRecorderHandler_h