gpu: Notify callbacks the reason for channel creation failure

content/browser/gpu/gpu_client.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/gpu/gpu_client.h"
 
 #include "content/browser/gpu/browser_gpu_memory_buffer_manager.h"
 #include "content/browser/gpu/gpu_process_host.h"
 #include "content/common/child_process_host_impl.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 23 matching lines @@
     return;
   BrowserGpuMemoryBufferManager* gpu_memory_buffer_manager =
       BrowserGpuMemoryBufferManager::current();
   if (gpu_memory_buffer_manager)
     gpu_memory_buffer_manager->ProcessRemoved(render_process_id_);
 }
 
 void GpuClient::OnEstablishGpuChannel(
     const EstablishGpuChannelCallback& callback,
     const IPC::ChannelHandle& channel,
-    const gpu::GPUInfo& gpu_info) {
+    const gpu::GPUInfo& gpu_info,
+    GpuProcessHost::EstablishChannelStatus status) {
   mojo::ScopedMessagePipeHandle channel_handle;
   channel_handle.reset(channel.mojo_handle);
   callback.Run(render_process_id_, std::move(channel_handle), gpu_info);
 }
 
 void GpuClient::OnCreateGpuMemoryBuffer(
     const CreateGpuMemoryBufferCallback& callback,
     const gfx::GpuMemoryBufferHandle& handle) {
   callback.Run(handle);
 }
 
 void GpuClient::EstablishGpuChannel(
     const EstablishGpuChannelCallback& callback) {
   GpuProcessHost* host =
       GpuProcessHost::Get(GpuProcessHost::GPU_PROCESS_KIND_SANDBOXED);
   if (!host) {
-    OnEstablishGpuChannel(callback, IPC::ChannelHandle(), gpu::GPUInfo());
+    OnEstablishGpuChannel(
+        callback, IPC::ChannelHandle(), gpu::GPUInfo(),
+        GpuProcessHost::EstablishChannelStatus::GPU_ACCESS_DENIED);
     return;
   }
 
   bool preempts = false;
   bool allow_view_command_buffers = false;
   bool allow_real_time_streams = false;
   host->EstablishGpuChannel(
       render_process_id_,
       ChildProcessHostImpl::ChildProcessUniqueIdToTracingProcessId(
           render_process_id_),
@@ skipping 26 matching lines @@
 
 void GpuClient::DestroyGpuMemoryBuffer(gfx::GpuMemoryBufferId id,
                                        const gpu::SyncToken& sync_token) {
   DCHECK(BrowserGpuMemoryBufferManager::current());
 
   BrowserGpuMemoryBufferManager::current()->ChildProcessDeletedGpuMemoryBuffer(
       id, render_process_id_, sync_token);
 }
 
 }  // namespace content