gpu: Use mus gpu interface in non-mus chrome.

content/gpu/gpu_main.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 <stddef.h>
 #include <stdlib.h>
 
 #include <memory>
 #include <utility>
 
@@ skipping 244 matching lines @@
 #endif
 
   gpu_init.set_sandbox_helper(&sandbox_helper);
 
   // Gpu initialization may fail for various reasons, in which case we will need
   // to tear down this process. However, we can not do so safely until the IPC
   // channel is set up, because the detection of early return of a child process
   // is implemented using an IPC channel error. If the IPC channel is not fully
   // set up between the browser and GPU process, and the GPU process crashes or
   // exits early, the browser process will never detect it.  For this reason we
-  // defer tearing down the GPU process until receiving the GpuMsg_Initialize
-  // message from the browser.
+  // defer tearing down the GPU process until receiving the initialization
+  // message from the browser (through mojom::GpuMain::CreateGpuService()).
   const bool init_success = gpu_init.InitializeAndStartSandbox(command_line);
   const bool dead_on_arrival = !init_success;
 
   logging::SetLogMessageHandler(NULL);
   GetContentClient()->SetGpuInfo(gpu_init.gpu_info());
 
   std::unique_ptr<gpu::GpuMemoryBufferFactory> gpu_memory_buffer_factory;
   if (init_success &&
       gpu::GetNativeGpuMemoryBufferType() != gfx::EMPTY_BUFFER)
     gpu_memory_buffer_factory = gpu::GpuMemoryBufferFactory::CreateNativeType();
@@ skipping 81 matching lines @@
     return true;
   }
 
   return false;
 }
 #endif  // defined(OS_WIN)
 
 }  // namespace.
 
 }  // namespace content