content: Don't keep requesting the GpuChannelHost during shutdown.

content/browser/renderer_host/context_provider_factory_impl_android.cc

 // 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 "content/browser/renderer_host/context_provider_factory_impl_android.h"
 
 #include "base/auto_reset.h"
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "base/memory/singleton.h"
@@ skipping 217 matching lines @@
       FROM_HERE, base::TimeDelta::FromSeconds(kGpuChannelTimeoutInSeconds),
       this, &ContextProviderFactoryImpl::OnGpuChannelTimeout);
 
   return nullptr;
 }
 
 void ContextProviderFactoryImpl::OnGpuChannelEstablished(
     scoped_refptr<gpu::GpuChannelHost> gpu_channel) {
   establish_gpu_channel_timeout_.Stop();
 
+  // This should happen only during shutdown. So early out instead of queuing
+  // more requests with the factory.
+  if (!gpu_channel)
+    return;
+
   // We can queue the Gpu Channel initialization requests multiple times as
   // we get context requests. So we might have already handled any pending
   // requests when this callback runs.
   if (!context_provider_requests_.empty())
     HandlePendingRequests();
 }
 
 void ContextProviderFactoryImpl::OnGpuChannelTimeout() {
   LOG(FATAL) << "Timed out waiting for GPU channel.";
 }
 
 }  // namespace content