Basic use implementation for MediaStream from Canvas: captureStream()

third_party/WebKit/public/platform/Platform.h

Index: third_party/WebKit/public/platform/Platform.h
diff --git a/third_party/WebKit/public/platform/Platform.h b/third_party/WebKit/public/platform/Platform.h
index 1703be68b1f34e2408953a601ff131018099bc67..dd436503ee65c62de8457cda62af5b1878f4adc0 100644
--- a/third_party/WebKit/public/platform/Platform.h
+++ b/third_party/WebKit/public/platform/Platform.h
@@ -61,6 +61,7 @@ namespace blink {
 
 class WebAudioBus;
 class WebBlobRegistry;
+class WebCanvasCaptureHandler;
 class WebClipboard;
 class WebCompositorSupport;
 class WebConvertableToTraceFormat;
@@ -80,6 +81,7 @@ class WebIDBFactory;
 class WebMIDIAccessor;
 class WebMIDIAccessorClient;
 class WebMediaRecorderHandler;
+class WebMediaStream;
 class WebMediaStreamCenter;
 class WebMediaStreamCenterClient;
 class WebMemoryDumpProvider;
@@ -644,6 +646,8 @@ public:
     // May return null if WebRTC functionality is not avaliable or out of resources.
     virtual WebMediaStreamCenter* createMediaStreamCenter(WebMediaStreamCenterClient*) { return nullptr; }
 
+    // Creates an WebCanvasCaptureHandler to capture Canvas output.
+    virtual WebCanvasCaptureHandler* createCanvasCaptureHandler(const WebSize&, double, WebMediaStream*) { return nullptr; }
     // WebWorker ----------------------------------------------------------
 
     virtual void didStartWorkerRunLoop() { }