Fixed WebglRenderingContextBase toImageData

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/frame/ImageBitmap.h"
 #include "core/frame/Settings.h"
 #include "core/workers/WorkerGlobalScope.h"
@@ skipping 155 matching lines @@
     SnapshotReason reason) const {
   if (!imageBuffer())
     return nullptr;
   sk_sp<SkImage> skImage = m_imageBuffer->newSkImageSnapshot(hint, reason);
   RefPtr<StaticBitmapImage> image =
       StaticBitmapImage::create(std::move(skImage));
   return image;
 }
 
 ImageData* OffscreenCanvasRenderingContext2D::toImageData(
-    SnapshotReason reason) const {
+    SnapshotReason reason) {
   if (!imageBuffer())
     return nullptr;
   sk_sp<SkImage> snapshot =
       m_imageBuffer->newSkImageSnapshot(PreferNoAcceleration, reason);
   ImageData* imageData = nullptr;
   if (snapshot) {
     imageData = ImageData::create(this->getOffscreenCanvas()->size());
     SkImageInfo imageInfo =
         SkImageInfo::Make(this->width(), this->height(), kRGBA_8888_SkColorType,
                           kUnpremul_SkAlphaType);
@@ skipping 62 matching lines @@
 }
 
 bool OffscreenCanvasRenderingContext2D::isContextLost() const {
   return false;
 }
 
 bool OffscreenCanvasRenderingContext2D::isPaintable() const {
   return this->imageBuffer();
 }
 }