Pull in various gpu/command_buffer fixes from chromium

gpu/config/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/ui.gni")
 
 declare_args() {
   # Use the PCI lib to collect GPU information on Linux.
   use_libpci = true
 }
@@ skipping 17 matching lines @@
     "gpu_info.h",
     "gpu_info_collector.cc",
     "gpu_info_collector.h",
     "gpu_info_collector_android.cc",
     "gpu_info_collector_linux.cc",
     "gpu_info_collector_linux.h",
     "gpu_info_collector_mac.mm",
     "gpu_info_collector_ozone.cc",
     "gpu_info_collector_win.cc",
     "gpu_info_collector_x11.cc",
+    "gpu_switches.cc",
+    "gpu_switches.h",
     "gpu_test_config.cc",
     "gpu_test_config.h",
     "gpu_test_expectations_parser.cc",
     "gpu_test_expectations_parser.h",
     "gpu_util.cc",
     "gpu_util.h",
     "software_rendering_list_json.cc",
   ]
 
   configs += [
@@ skipping 40 matching lines @@
       "//third_party/libXNVCtrl",
       "//ui/gfx/x",
     ]
   } else {
     sources -= [ "gpu_info_collector_x11.cc" ]
   }
   if (!use_ozone) {
     sources -= [ "gpu_info_collector_ozone.cc" ]
   }
 }