Compute GpuDriverBugWorkarounds only one time in the GPU process

gpu/config/gpu_driver_bug_workarounds.h

+// 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.
+
+#ifndef GPU_CONFIG_GPU_DRIVER_BUG_WORKAROUNDS_H_
+#define GPU_CONFIG_GPU_DRIVER_BUG_WORKAROUNDS_H_
+
+#include "base/macros.h"
+#include "build/build_config.h"
+#include "gpu/command_buffer/service/common_decoder.h"
+#include "gpu/config/gpu_driver_bug_workaround_type.h"
+#include "gpu/gpu_export.h"
+
+namespace base {
+class CommandLine;
+}
+
+namespace gpu {
+
+struct GPU_EXPORT GpuDriverBugWorkarounds {
+ public:
+  static void Initialize(GpuDriverBugWorkarounds& workarounds);

[piman, 2016/04/12 04:38:44]

If you make this (and below) like:
static GpuDriverBugWorkarounds Create();
Then a lot of code you added becomes simpler (e.g. you can initialize fields
with initializers).

+  static void Initialize(const base::CommandLine* command_line,
+                         GpuDriverBugWorkarounds& workarounds);
+  GpuDriverBugWorkarounds();
+
+  GpuDriverBugWorkarounds(const GpuDriverBugWorkarounds& other);
+
+  ~GpuDriverBugWorkarounds();
+
+#define GPU_OP(type, name) bool name;
+  GPU_DRIVER_BUG_WORKAROUNDS(GPU_OP)
+#undef GPU_OP
+
+  // Note: 0 here means use driver limit.
+  GLint max_texture_size;
+  GLint max_cube_map_texture_size;
+  GLint max_fragment_uniform_vectors;
+  GLint max_varying_vectors;
+  GLint max_vertex_uniform_vectors;
+  GLint max_copy_texture_chromium_size;
+};
+
+GPU_EXPORT void StringToWorkarounds(const std::string& types,
+                                    GpuDriverBugWorkarounds* workarounds);
+
+}  // namespace gpu
+
+#endif  // GPU_CONFIG_GPU_DRIVER_BUG_WORKAROUNDS_H_