Remove WebGraphicsContext3DCommandBufferImpl::IsCommandBufferContextLost

content/renderer/render_thread_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/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <utility>
@@ skipping 1474 matching lines @@
         enable_gpu_memory_buffer_video_frames, image_texture_targets,
         enable_video_accelerator));
     return gpu_factories_.back();
   }
   return nullptr;
 }
 
 std::unique_ptr<WebGraphicsContext3DCommandBufferImpl>
 RenderThreadImpl::CreateOffscreenContext3d() {
   // This is used to create a few different offscreen contexts:
-  // - The shared main thread context (offscreen) used by blink for canvas
+  // - The shared main thread context (offscreen) used by blink for canvas.
   // - The worker context (offscreen) used for GPU raster and video decoding.
   // This is for an offscreen context, so the default framebuffer doesn't need
   // alpha, depth, stencil, antialiasing.
   gpu::gles2::ContextCreationAttribHelper attributes;
   attributes.alpha_size = -1;
   attributes.depth_size = 0;
   attributes.stencil_size = 0;
   attributes.samples = 0;
   attributes.sample_buffers = 0;
   attributes.bind_generates_resource = false;
   attributes.lose_context_when_out_of_memory = true;
   bool share_resources = true;
   bool automatic_flushes = false;
   scoped_refptr<gpu::GpuChannelHost> gpu_channel_host(EstablishGpuChannelSync(
       CAUSE_FOR_GPU_LAUNCH_WEBGRAPHICSCONTEXT3DCOMMANDBUFFERIMPL_INITIALIZE));
+  if (!gpu_channel_host)
+    return nullptr;
   return base::WrapUnique(
       WebGraphicsContext3DCommandBufferImpl::CreateOffscreenContext(
           gpu_channel_host.get(), attributes, gfx::PreferIntegratedGpu,
           share_resources, automatic_flushes,
           GURL("chrome://gpu/RenderThreadImpl::CreateOffscreenContext3d"),
           WebGraphicsContext3DCommandBufferImpl::SharedMemoryLimits(), NULL));
 }
 
 scoped_refptr<cc_blink::ContextProviderWebContext>
 RenderThreadImpl::SharedMainThreadContextProvider() {
@@ skipping 624 matching lines @@
 }
 
 void RenderThreadImpl::PendingRenderFrameConnect::OnConnectionError() {
   size_t erased =
       RenderThreadImpl::current()->pending_render_frame_connects_.erase(
           routing_id_);
   DCHECK_EQ(1u, erased);
 }
 
 }  // namespace content