Refactor ImageBuffer to make OffscreenCanvas match HTMLCanvasElement

third_party/WebKit/Source/core/frame/ImageBitmap.cpp

 // Copyright 2013 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 "core/frame/ImageBitmap.h"
 
 #include <memory>
 #include "core/html/HTMLCanvasElement.h"
 #include "core/html/HTMLVideoElement.h"
 #include "core/html/ImageData.h"
@@ skipping 1094 matching lines @@
   if (!IsResizeOptionValid(options, exception_state))
     return ScriptPromise();
   return ImageBitmapSource::FulfillImageBitmap(
       script_state, Create(this, crop_rect, options));
 }
 
 PassRefPtr<Image> ImageBitmap::GetSourceImageForCanvas(
     SourceImageStatus* status,
     AccelerationHint,
     SnapshotReason,
-    const FloatSize&) const {
+    const FloatSize&) {
   *status = kNormalSourceImageStatus;
   if (!image_)
     return nullptr;
   if (image_->IsPremultiplied())
     return image_;
   // Skia does not support drawing unpremul SkImage on SkCanvas.
   // Premultiply and return.
   sk_sp<SkImage> premul_sk_image =
       UnPremulSkImageToPremul(image_->ImageForCurrentFrame().get());
   return StaticBitmapImage::Create(premul_sk_image);
 }
 
 void ImageBitmap::AdjustDrawRects(FloatRect* src_rect,
                                   FloatRect* dst_rect) const {}
 
 FloatSize ImageBitmap::ElementSize(const FloatSize&) const {
   return FloatSize(width(), height());
 }
 
 DEFINE_TRACE(ImageBitmap) {}
 
 }  // namespace blink