Add TimedCanvasDrawListener

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

 // 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.
 
 #include "modules/mediacapturefromelement/HTMLCanvasElementCapture.h"
 
 #include "core/dom/ExceptionCode.h"
 #include "core/html/HTMLCanvasElement.h"
 #include "modules/mediacapturefromelement/CanvasCaptureMediaStreamTrack.h"
 #include "modules/mediastream/MediaStream.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebCanvasCaptureHandler.h"
 #include "public/platform/WebMediaStream.h"
 #include "public/platform/WebMediaStreamTrack.h"
 
 namespace {
 const double kDefaultFrameRate = 60.0;
 } // anonymous namespace
 
 namespace blink {
 
 MediaStream* HTMLCanvasElementCapture::captureStream(HTMLCanvasElement& element, ExceptionState& exceptionState)
 {
+    return HTMLCanvasElementCapture::captureStream(element, false, 0, exceptionState);
+}
+
+MediaStream* HTMLCanvasElementCapture::captureStream(HTMLCanvasElement& element, double frameRate, ExceptionState& exceptionState)
+{
+    return HTMLCanvasElementCapture::captureStream(element, true, frameRate, exceptionState);
+}
+
+MediaStream* HTMLCanvasElementCapture::captureStream(HTMLCanvasElement& element, bool givenFrameRate, double frameRate, ExceptionState& exceptionState)
+{
     if (!element.originClean()) {
         exceptionState.throwDOMException(SecurityError, "Canvas is not origin-clean.");
         return MediaStream::create(element.executionContext());
     }
 
     WebMediaStreamTrack track;
     WebSize size(element.width(), element.height());
-    OwnPtr<WebCanvasCaptureHandler> handler = adoptPtr(Platform::current()->createCanvasCaptureHandler(size, kDefaultFrameRate, &track));
+    OwnPtr<WebCanvasCaptureHandler> handler;
+    if (givenFrameRate)
+        handler = adoptPtr(Platform::current()->createCanvasCaptureHandler(size, frameRate, &track));
+    else
+        handler = adoptPtr(Platform::current()->createCanvasCaptureHandler(size, kDefaultFrameRate, &track));
     ASSERT(handler);
     if (!handler) {
         exceptionState.throwDOMException(NotSupportedError, "No CanvasCapture handler can be created.");
         return MediaStream::create(element.executionContext());
     }
 
     MediaStreamTrackVector tracks;
-    tracks.append(CanvasCaptureMediaStreamTrack::create(track, &element, handler.release()));
+    if (givenFrameRate)
+        tracks.append(CanvasCaptureMediaStreamTrack::create(track, &element, handler.release(), frameRate));
+    else
+        tracks.append(CanvasCaptureMediaStreamTrack::create(track, &element, handler.release()));
     return MediaStream::create(element.executionContext(), tracks);
 }
 
 } // namespace blink