DrawingBuffer: Use gfx::GpuMemoryBuffer directly and set color space

content/renderer/renderer_blink_platform_impl.cc

 // Copyright (c) 2012 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 "content/renderer/renderer_blink_platform_impl.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/command_line.h"
@@ skipping 1067 matching lines @@
   bool is_software_rendering = host->gpu_info().software_rendering;
 
   return new WebGraphicsContext3DProviderImpl(std::move(provider),
                                               is_software_rendering);
 }
 
 //------------------------------------------------------------------------------
 
 gpu::GpuMemoryBufferManager*
 RendererBlinkPlatformImpl::getGpuMemoryBufferManager() {
-  return RenderThreadImpl::current()->GetGpuMemoryBufferManager();
+  RenderThreadImpl* thread = RenderThreadImpl::current();
+  return thread ? thread->GetGpuMemoryBufferManager() : nullptr;
 }
 
 //------------------------------------------------------------------------------
 
 std::unique_ptr<cc::SharedBitmap>
 RendererBlinkPlatformImpl::allocateSharedBitmap(const blink::WebSize& size) {
   return shared_bitmap_manager_
       ->AllocateSharedBitmap(gfx::Size(size.width, size.height));
 }
 
@@ skipping 188 matching lines @@
   return &trial_token_validator_;
 }
 
 void RendererBlinkPlatformImpl::workerContextCreated(
     const v8::Local<v8::Context>& worker) {
   GetContentClient()->renderer()->DidInitializeWorkerContextOnWorkerThread(
       worker);
 }
 
 }  // namespace content