color: Add ColorCanvasExtensions runtime flag

third_party/WebKit/Source/modules/csspaint/PaintRenderingContext2D.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/csspaint/PaintRenderingContext2D.h"
 
 #include "platform/graphics/ImageBuffer.h"
 #include "platform/graphics/paint/PaintCanvas.h"
 #include <memory>
 
@@ skipping 30 matching lines @@
 bool PaintRenderingContext2D::ParseColorOrCurrentColor(
     Color& color,
     const String& color_string) const {
   // We ignore "currentColor" for PaintRenderingContext2D and just make it
   // "black". "currentColor" can be emulated by having "color" as an input
   // property for the css-paint-api.
   // https://github.com/w3c/css-houdini-drafts/issues/133
   return ::blink::ParseColorOrCurrentColor(color, color_string, nullptr);
 }
 
-ColorBehavior PaintRenderingContext2D::DrawImageColorBehavior() const {
-  return ColorBehavior::TransformToGlobalTarget();
-}
-
 PaintCanvas* PaintRenderingContext2D::DrawingCanvas() const {
   return image_buffer_->Canvas();
 }
 
 PaintCanvas* PaintRenderingContext2D::ExistingDrawingCanvas() const {
   DCHECK(image_buffer_);
   return image_buffer_->Canvas();
 }
 
 AffineTransform PaintRenderingContext2D::BaseTransform() const {
   DCHECK(image_buffer_);
   return image_buffer_->BaseTransform();
 }
 
 void PaintRenderingContext2D::DidDraw(const SkIRect& dirty_rect) {
   DCHECK(image_buffer_);
   return image_buffer_->DidDraw(SkRect::Make(dirty_rect));
 }
 
 void PaintRenderingContext2D::ValidateStateStack() const {
 #if DCHECK_IS_ON()
   if (PaintCanvas* sk_canvas = ExistingDrawingCanvas()) {
     DCHECK_EQ(static_cast<size_t>(sk_canvas->getSaveCount()),
               state_stack_.size() + 1);
   }
 #endif
 }
 
 }  // namespace blink