Refactor ImageBuffer to make OffscreenCanvas match HTMLCanvasElement

third_party/WebKit/Source/core/html/canvas/ImageElementBase.cpp

 // Copyright 2017 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/html/canvas/ImageElementBase.h"
 
 #include "core/frame/ImageBitmap.h"
 #include "core/frame/LocalDOMWindow.h"
 #include "core/layout/LayoutObject.h"
 #include "core/loader/ImageLoader.h"
@@ skipping 10 matching lines @@
 }
 
 bool ImageElementBase::IsSVGSource() const {
   return CachedImage() && CachedImage()->GetImage()->IsSVGImage();
 }
 
 PassRefPtr<Image> ImageElementBase::GetSourceImageForCanvas(
     SourceImageStatus* status,
     AccelerationHint,
     SnapshotReason,
-    const FloatSize& default_object_size) const {
+    const FloatSize& default_object_size) {
   if (!GetImageLoader().ImageComplete() || !CachedImage()) {
     *status = kIncompleteSourceImageStatus;
     return nullptr;
   }
 
   if (CachedImage()->ErrorOccurred()) {
     *status = kUndecodableSourceImageStatus;
     return nullptr;
   }
 
@@ skipping 111 matching lines @@
     return ScriptPromise();
   if (!ImageBitmap::IsResizeOptionValid(options, exception_state))
     return ScriptPromise();
   return ImageBitmapSource::FulfillImageBitmap(
       script_state, ImageBitmap::Create(
                         this, crop_rect,
                         event_target.ToLocalDOMWindow()->document(), options));
 }
 
 }  // namespace blink