Defered collect DirectX diagnostics until they are needed for about:gpu....

chrome/common/gpu_param_traits.h

 // Copyright (c) 2010 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 CHROME_COMMON_GPU_PARAM_TRAITS_H_
 #define CHROME_COMMON_GPU_PARAM_TRAITS_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/process.h"
@@ skipping 54 matching lines @@
 
 template <>
 struct ParamTraits<GPUInfo> {
   typedef GPUInfo param_type;
   static void Write(Message* m, const param_type& p);
   static bool Read(const Message* m, void** iter, param_type* p);
   static void Log(const param_type& p, std::string* l);
 };
 
 template <>
+struct ParamTraits<GPUInfo::Level> {
+  typedef GPUInfo::Level param_type;
+  static void Write(Message* m, const param_type& p);
+  static bool Read(const Message* m, void** iter, param_type* p);
+  static void Log(const param_type& p, std::string* l);
+};
+
+template <>
 struct ParamTraits<DxDiagNode> {
   typedef DxDiagNode param_type;
   static void Write(Message* m, const param_type& p);
   static bool Read(const Message* m, void** iter, param_type* p);
   static void Log(const param_type& p, std::string* l);
 };
 
 template <>
 struct ParamTraits<gpu::CommandBuffer::State> {
   typedef gpu::CommandBuffer::State param_type;
   static void Write(Message* m, const param_type& p);
   static bool Read(const Message* m, void** iter, param_type* p);
   static void Log(const param_type& p, std::string* l);
 };
 
 template <>
 struct ParamTraits<GPUCreateCommandBufferConfig> {
   typedef GPUCreateCommandBufferConfig param_type;
   static void Write(Message* m, const param_type& p);
   static bool Read(const Message* m, void** iter, param_type* p);
   static void Log(const param_type& p, std::string* l);
 };
 
 }  // namespace IPC
 
 #endif  // CHROME_COMMON_GPU_PARAM_TRAITS_H_