color: Add ColorCanvasExtensions runtime flag

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/dom/ExecutionContext.h"
 #include "core/frame/ImageBitmap.h"
 #include "core/frame/Settings.h"
@@ skipping 78 matching lines @@
 
 bool OffscreenCanvasRenderingContext2D::HasImageBuffer() const {
   return host()->GetImageBuffer();
 }
 
 void OffscreenCanvasRenderingContext2D::Reset() {
   host()->DiscardImageBuffer();
   BaseRenderingContext2D::Reset();
 }
 
-ColorBehavior OffscreenCanvasRenderingContext2D::DrawImageColorBehavior()
-    const {
-  return CanvasRenderingContext::ColorBehaviorForMediaDrawnToCanvas();
-}
-
 ImageBuffer* OffscreenCanvasRenderingContext2D::GetImageBuffer() const {
   return const_cast<CanvasRenderingContextHost*>(host())
       ->GetOrCreateImageBuffer();
 }
 
 RefPtr<StaticBitmapImage>
 OffscreenCanvasRenderingContext2D::TransferToStaticBitmapImage() {
   if (!GetImageBuffer())
     return nullptr;
   sk_sp<SkImage> sk_image = GetImageBuffer()->NewSkImageSnapshot(
@@ skipping 114 matching lines @@
 }
 
 CanvasPixelFormat OffscreenCanvasRenderingContext2D::PixelFormat() const {
   return color_params().pixel_format();
 }
 
 bool OffscreenCanvasRenderingContext2D::IsAccelerated() const {
   return HasImageBuffer() && GetImageBuffer()->IsAccelerated();
 }
 }