adds WARP support to Chromium, for Metro mode only, on Windows 8

gpu/config/gpu_info_collector.h

 // Copyright (c) 2012 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_INFO_COLLECTOR_H_
 #define GPU_CONFIG_GPU_INFO_COLLECTOR_H_
 
 #include "base/basictypes.h"
 #include "build/build_config.h"
 #include "gpu/config/gpu_info.h"
@@ skipping 28 matching lines @@
 // The subset each platform collects may be different.
 GPU_EXPORT CollectInfoResult CollectBasicGraphicsInfo(GPUInfo* gpu_info);
 
 // Create a GL/DirectX context and collect related info.
 // This is called at GPU process startup time.
 GPU_EXPORT CollectInfoResult CollectContextGraphicsInfo(GPUInfo* gpu_info);
 
 #if defined(OS_WIN)
 // Collect the DirectX Disagnostics information about the attached displays.
 GPU_EXPORT bool GetDxDiagnostics(DxDiagNode* output);
+
+GPU_EXPORT bool ShouldFallbackToWarp();
+
+GPU_EXPORT void SetShouldFallbackToWarp(bool enable);
 #endif  // OS_WIN
 
 // Create a GL context and collect GL strings and versions.
 GPU_EXPORT CollectInfoResult CollectGraphicsInfoGL(GPUInfo* gpu_info);
 
 // Each platform stores the driver version on the GL_VERSION string differently
 GPU_EXPORT CollectInfoResult CollectDriverInfoGL(GPUInfo* gpu_info);
 
 // Merge GPUInfo from CollectContextGraphicsInfo into basic GPUInfo.
 // This is platform specific, depending on which info are collected at which
 // stage.
 GPU_EXPORT void MergeGPUInfo(GPUInfo* basic_gpu_info,
                              const GPUInfo& context_gpu_info);
 
 // MergeGPUInfo() when GL driver is used.
 GPU_EXPORT void MergeGPUInfoGL(GPUInfo* basic_gpu_info,
                                const GPUInfo& context_gpu_info);
 
 }  // namespace gpu
 
 #endif  // GPU_CONFIG_GPU_INFO_COLLECTOR_H_