Wip - cl for implemening VideoTrackSource::ApplyConstraints(constraints, VideoTrack) and adopt safe…

third_party/WebKit/Source/modules/mediacapturefromelement/HTMLCanvasElementCapture.cpp

Index: third_party/WebKit/Source/modules/mediacapturefromelement/HTMLCanvasElementCapture.cpp
diff --git a/third_party/WebKit/Source/modules/mediacapturefromelement/HTMLCanvasElementCapture.cpp b/third_party/WebKit/Source/modules/mediacapturefromelement/HTMLCanvasElementCapture.cpp
index cb88f4c953e618a3610b432fddb29412813d7a3b..7c18504199c6eca94ca84ca0e7a00ad79fb48eec 100644
--- a/third_party/WebKit/Source/modules/mediacapturefromelement/HTMLCanvasElementCapture.cpp
+++ b/third_party/WebKit/Source/modules/mediacapturefromelement/HTMLCanvasElementCapture.cpp
@@ -43,19 +43,18 @@ MediaStream* HTMLCanvasElementCapture::captureStream(HTMLCanvasElement& element,
         return nullptr;
     }
 
-    WebMediaStreamTrack track;
+
     const WebSize size(element.width(), element.height());
     std::unique_ptr<WebCanvasCaptureHandler> handler;
-    if (givenFrameRate)
-        handler = wrapUnique(Platform::current()->createCanvasCaptureHandler(size, frameRate, &track));
-    else
-        handler = wrapUnique(Platform::current()->createCanvasCaptureHandler(size, kDefaultFrameRate, &track));
 
+    handler = wrapUnique(Platform::current()->createCanvasCaptureHandler());
     if (!handler) {
         exceptionState.throwDOMException(NotSupportedError, "No CanvasCapture handler can be created.");
         return nullptr;
     }
 
+    WebMediaStreamTrack track = handler->createTrack(size, givenFrameRate ? frameRate : kDefaultFrameRate);
+
     CanvasCaptureMediaStreamTrack* canvasTrack;
     if (givenFrameRate)
         canvasTrack = CanvasCaptureMediaStreamTrack::create(track, &element, std::move(handler), frameRate);