color: Add ColorCanvasExtensions runtime flag

third_party/WebKit/Source/modules/csspaint/PaintRenderingContext2D.h

 // 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.
 
 #ifndef PaintRenderingContext2D_h
 #define PaintRenderingContext2D_h
 
 #include <memory>
 #include "modules/ModulesExport.h"
 #include "modules/canvas2d/BaseRenderingContext2D.h"
@@ skipping 41 matching lines @@
   bool ParseColorOrCurrentColor(Color&, const String& color_string) const final;
 
   PaintCanvas* DrawingCanvas() const final;
   PaintCanvas* ExistingDrawingCanvas() const final;
   void DisableDeferral(DisableDeferralReason) final {}
 
   AffineTransform BaseTransform() const final;
 
   void DidDraw(const SkIRect& dirty_rect) final;
 
-  ColorBehavior DrawImageColorBehavior() const final;
-
   // TODO(ikilpatrick): We'll need to either only accept resolved filters
   // from a typed-om <filter> object, or use the appropriate style resolution
   // host to determine 'em' units etc in filters. At the moment just pretend
   // that we don't have a filter set.
   bool StateHasFilter() final { return false; }
   sk_sp<SkImageFilter> StateGetFilter() final { return nullptr; }
   void SnapshotStateForFilter() final {}
 
   void ValidateStateStack() const final;
 
   bool HasAlpha() const final { return has_alpha_; }
 
   // PaintRenderingContext2D cannot lose it's context.
   bool isContextLost() const final { return false; }
 
  private:
   PaintRenderingContext2D(std::unique_ptr<ImageBuffer>,
                           bool has_alpha,
                           float zoom);
 
   std::unique_ptr<ImageBuffer> image_buffer_;
   bool has_alpha_;
 };
 
 }  // namespace blink
 
 #endif  // PaintRenderingContext2D_h