Pull in various gpu/command_buffer fixes from chromium

gpu/config/gpu_switches.cc

Index: gpu/config/gpu_switches.cc
diff --git a/gpu/config/gpu_switches.cc b/gpu/config/gpu_switches.cc
new file mode 100644
index 0000000000000000000000000000000000000000..fdf9f0e180bebd44ce7e5b58e04f4208bfe0820b
--- /dev/null
+++ b/gpu/config/gpu_switches.cc
@@ -0,0 +1,12 @@
+// Copyright 2015 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 "gpu/config/gpu_switches.h"
+
+namespace switches {
+
+// Pass a set of GpuDriverBugWorkaroundType ids, seperated by ','.
+const char kGpuDriverBugWorkarounds[] = "gpu-driver-bug-workarounds";
+
+}  // namespace switches