mus: Always use the GPU compositor for mus.

content/browser/gpu/gpu_data_manager_impl_private.cc

 // Copyright (c) 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/browser/gpu/gpu_data_manager_impl_private.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 19 matching lines @@
 #include "content/public/common/web_preferences.h"
 #include "gpu/command_buffer/service/gpu_preferences.h"
 #include "gpu/command_buffer/service/gpu_switches.h"
 #include "gpu/config/gpu_control_list_jsons.h"
 #include "gpu/config/gpu_driver_bug_workaround_type.h"
 #include "gpu/config/gpu_feature_type.h"
 #include "gpu/config/gpu_info_collector.h"
 #include "gpu/config/gpu_switches.h"
 #include "gpu/config/gpu_util.h"
 #include "gpu/ipc/common/memory_stats.h"
+#include "services/shell/runner/common/client_util.h"
 #include "ui/base/ui_base_switches.h"
 #include "ui/gl/gl_implementation.h"
 #include "ui/gl/gl_switches.h"
 #include "ui/gl/gpu_switching_manager.h"
 
 #if defined(OS_MACOSX)
 #include <ApplicationServices/ApplicationServices.h>
 #endif  // OS_MACOSX
 #if defined(OS_WIN)
 #include "base/win/windows_version.h"
@@ skipping 928 matching lines @@
         gpu_info_.secondary_gpus[ii].active = false;
       }
     }
     gpu_info_.gpu.active = false;
   }
   UpdateGpuInfoHelper();
   return true;
 }
 
 bool GpuDataManagerImplPrivate::CanUseGpuBrowserCompositor() const {
+  if (shell::ShellIsRemote())

[rjkroege, 2016/08/11 17:55:38]

While this is fine for now, I think that it's not the right solution long term.
The browser (mus client in this case) should be asking mus about all of these
details yes? So add a TODO?

[sadrul, 2016/08/11 17:58:08]

What sort of details do you have in mind? (we use shell::ShellIsRemote() to
detect when chrome is running in mus in a number of places).

+    return true;
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kDisableGpuCompositing))
     return false;
   if (ShouldUseSwiftShader())
     return false;
   if (IsFeatureBlacklisted(gpu::GPU_FEATURE_TYPE_GPU_COMPOSITING))
     return false;
   return true;
 }
 
@@ skipping 299 matching lines @@
   gpu_info_.context_info_state = gpu::kCollectInfoFatalFailure;
 #if defined(OS_WIN)
   gpu_info_.dx_diagnostics_info_state = gpu::kCollectInfoFatalFailure;
 #endif
   complete_gpu_info_already_requested_ = true;
   // Some observers might be waiting.
   NotifyGpuInfoUpdate();
 }
 
 }  // namespace content