Add timer to OffscreenCanvas's commit API

third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.cpp

 // 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.
 
 #include "modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.h"
 
 #include "bindings/modules/v8/OffscreenCanvasRenderingContext2DOrWebGLRenderingContextOrWebGL2RenderingContext.h"
 #include "core/frame/ImageBitmap.h"
 #include "core/frame/Settings.h"
 #include "core/workers/WorkerGlobalScope.h"
 #include "core/workers/WorkerSettings.h"
 #include "platform/graphics/ImageBuffer.h"
 #include "platform/graphics/StaticBitmapImage.h"
 #include "platform/graphics/UnacceleratedImageBufferSurface.h"
 #include "platform/graphics/gpu/AcceleratedImageBufferSurface.h"
 #include "wtf/Assertions.h"
+#include "wtf/CurrentTime.h"
 
 #define UNIMPLEMENTED ASSERT_NOT_REACHED
 
 namespace blink {
 
 OffscreenCanvasRenderingContext2D::~OffscreenCanvasRenderingContext2D() {}
 
 OffscreenCanvasRenderingContext2D::OffscreenCanvasRenderingContext2D(
     ScriptState* scriptState,
     OffscreenCanvas* canvas,
@@ skipping 21 matching lines @@
   if (getOffscreenCanvas()->getAssociatedCanvasId() < 0) {
     // If an OffscreenCanvas has no associated canvas Id, it indicates that
     // it is not an OffscreenCanvas created by transfering control from html
     // canvas.
     exceptionState.throwDOMException(InvalidStateError,
                                      "Commit() was called on a context whose "
                                      "OffscreenCanvas is not associated with a "
                                      "canvas element.");
     return;
   }
+  double commitStartTime = WTF::monotonicallyIncreasingTime();
   RefPtr<StaticBitmapImage> image = this->transferToStaticBitmapImage();
   getOffscreenCanvas()->getOrCreateFrameDispatcher()->dispatchFrame(
-      std::move(image));
+      std::move(image), commitStartTime);
 }
 
 // BaseRenderingContext2D implementation
 bool OffscreenCanvasRenderingContext2D::originClean() const {
   return getOffscreenCanvas()->originClean();
 }
 
 void OffscreenCanvasRenderingContext2D::setOriginTainted() {
   return getOffscreenCanvas()->setOriginTainted();
 }
@@ skipping 144 matching lines @@
 }
 
 bool OffscreenCanvasRenderingContext2D::isContextLost() const {
   return false;
 }
 
 bool OffscreenCanvasRenderingContext2D::isPaintable() const {
   return this->imageBuffer();
 }
 }