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

gpu/config/gpu_info_collector_win.cc

 // 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.
 
 #include "gpu/config/gpu_info_collector.h"
 
 // This has to be included before windows.h.
 #include "third_party/re2/re2/re2.h"
 
 #include <windows.h>
@@ skipping 614 matching lines @@
       base::MessageLoop::current()->PostDelayedTask(
           FROM_HERE,
           base::Bind(&CollectD3D11Support),
           base::TimeDelta::FromSeconds(45));
     }
   }
 
   return kCollectInfoSuccess;
 }
 
+namespace {
+  static bool g_should_fallback_to_warp = false;
+}
+
+bool ShouldFallbackToWarp() {
+  return g_should_fallback_to_warp;
+}
+
+void SetShouldFallbackToWarp(bool enable) {
+  g_should_fallback_to_warp = enable;
+}
+
 CollectInfoResult CollectDriverInfoGL(GPUInfo* gpu_info) {
   TRACE_EVENT0("gpu", "CollectDriverInfoGL");
 
   if (!gpu_info->driver_version.empty())
     return kCollectInfoSuccess;
 
   bool parsed = RE2::PartialMatch(
       gpu_info->gl_version, "([\\d\\.]+)$", &gpu_info->driver_version);
   return parsed ? kCollectInfoSuccess : kCollectInfoNonFatalFailure;
 }
 
 void MergeGPUInfo(GPUInfo* basic_gpu_info,
                   const GPUInfo& context_gpu_info) {
   DCHECK(basic_gpu_info);
 
   if (context_gpu_info.software_rendering) {
     basic_gpu_info->software_rendering = true;
     return;
   }
 
   MergeGPUInfoGL(basic_gpu_info, context_gpu_info);
 
   basic_gpu_info->dx_diagnostics = context_gpu_info.dx_diagnostics;
 }
 
 }  // namespace gpu