Re-land: cc: Implement shared worker contexts.

content/renderer/render_widget.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/render_widget.h"
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 1000 matching lines @@
 
   scoped_refptr<ContextProviderCommandBuffer> context_provider;
   scoped_refptr<ContextProviderCommandBuffer> worker_context_provider;
   if (!use_software) {
     context_provider = ContextProviderCommandBuffer::Create(
         CreateGraphicsContext3D(true), RENDER_COMPOSITOR_CONTEXT);
     if (!context_provider.get()) {
       // Cause the compositor to wait and try again.
       return nullptr;
     }
-
-    worker_context_provider = ContextProviderCommandBuffer::Create(
-        CreateGraphicsContext3D(false), RENDER_WORKER_CONTEXT);
-    if (!worker_context_provider.get()) {
+    worker_context_provider =
+        RenderThreadImpl::current()->SharedWorkerContextProvider();
+    if (!worker_context_provider) {
       // Cause the compositor to wait and try again.
       return nullptr;
     }
   }
 
   uint32 output_surface_id = next_output_surface_id_++;
   // Composite-to-mailbox is currently used for layout tests in order to cause
   // them to draw inside in the renderer to do the readback there. This should
   // no longer be the case when crbug.com/311404 is fixed.
   if (!RenderThreadImpl::current() ||
@@ skipping 1385 matching lines @@
 void RenderWidget::RegisterVideoHoleFrame(RenderFrameImpl* frame) {
   video_hole_frames_.AddObserver(frame);
 }
 
 void RenderWidget::UnregisterVideoHoleFrame(RenderFrameImpl* frame) {
   video_hole_frames_.RemoveObserver(frame);
 }
 #endif  // defined(VIDEO_HOLE)
 
 }  // namespace content