Check that |gpu_channel_host_| is not NULL before passing it along.

content/renderer/media/renderer_gpu_video_accelerator_factories.cc

 // Copyright 2013 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/media/renderer_gpu_video_accelerator_factories.h"
 
 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 
 #include "base/bind.h"
@@ skipping 41 matching lines @@
     unsigned image_texture_target,
     bool enable_video_accelerator)
     : task_runner_(task_runner),
       gpu_channel_host_(gpu_channel_host),
       context_provider_(context_provider),
       image_texture_target_(image_texture_target),
       video_accelerator_enabled_(enable_video_accelerator),
       gpu_memory_buffer_manager_(
           ChildThreadImpl::current()->gpu_memory_buffer_manager()),
       thread_safe_sender_(ChildThreadImpl::current()->thread_safe_sender()) {
+  DCHECK(gpu_channel_host_.get());
 }
 
 RendererGpuVideoAcceleratorFactories::~RendererGpuVideoAcceleratorFactories() {}
 
 void RendererGpuVideoAcceleratorFactories::BindContext() {
   DCHECK(task_runner_->BelongsToCurrentThread());
   if (!context_provider_->BindToCurrentThread())
     context_provider_ = NULL;
 }
 
@@ skipping 193 matching lines @@
 
 media::VideoEncodeAccelerator::SupportedProfiles
 RendererGpuVideoAcceleratorFactories::
     GetVideoEncodeAcceleratorSupportedProfiles() {
   return GpuVideoAcceleratorUtil::ConvertGpuToMediaEncodeProfiles(
       gpu_channel_host_->gpu_info()
           .video_encode_accelerator_supported_profiles);
 }
 
 }  // namespace content