content/ui[Android]: Remove ContextProviderFactory.

services/ui/public/cpp/gpu/gpu.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 "services/ui/public/cpp/gpu/gpu.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "build/build_config.h"
 #include "mojo/public/cpp/bindings/sync_call_restrictions.h"
@@ skipping 28 matching lines @@
     io_thread_.reset(new base::Thread("GPUIOThread"));
     base::Thread::Options thread_options(base::MessageLoop::TYPE_IO, 0);
     thread_options.priority = base::ThreadPriority::NORMAL;
     CHECK(io_thread_->StartWithOptions(thread_options));
     io_task_runner_ = io_thread_->task_runner();
   }
 }
 
 Gpu::~Gpu() {
   DCHECK(IsMainThread());
+  DCHECK(!in_shutdown_);
+
+  in_shutdown_ = true;
   for (const auto& callback : establish_callbacks_)
     callback.Run(nullptr);
   shutdown_event_.Signal();
   if (gpu_channel_)
     gpu_channel_->DestroyChannel();
 }
 
 // static
 std::unique_ptr<Gpu> Gpu::Create(
     service_manager::Connector* connector,
@@ skipping 24 matching lines @@
       std::move(gpu_channel), gpu::GPU_STREAM_DEFAULT,
       gpu::GpuStreamPriority::NORMAL, gpu::kNullSurfaceHandle,
       GURL("chrome://gpu/MusContextFactory"), automatic_flushes,
       support_locking, gpu::SharedMemoryLimits(), attributes,
       shared_context_provider, ui::command_buffer_metrics::MUS_CLIENT_CONTEXT));
 }
 
 void Gpu::EstablishGpuChannel(
     const gpu::GpuChannelEstablishedCallback& callback) {
   DCHECK(IsMainThread());
+
+  if (in_shutdown_)
+    return;
+
   scoped_refptr<gpu::GpuChannelHost> channel = GetGpuChannel();
   if (channel) {
     main_task_runner_->PostTask(FROM_HERE,
                                 base::Bind(callback, std::move(channel)));
     return;
   }
   establish_callbacks_.push_back(callback);
   if (gpu_)
     return;
 
@@ skipping 80 matching lines @@
   MojoResult result = mojo::UnwrapSharedMemoryHandle(
       std::move(handle), &platform_handle, &shared_memory_size, &readonly);
   if (result != MOJO_RESULT_OK)
     return nullptr;
   DCHECK_EQ(shared_memory_size, size);
 
   return base::MakeUnique<base::SharedMemory>(platform_handle, readonly);
 }
 
 }  // namespace ui