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

content/browser/gpu/gpu_data_manager_impl_private_unittest.cc

 // Copyright (c) 2013 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 "base/command_line.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/time/time.h"
 #include "content/browser/gpu/gpu_data_manager_impl_private.h"
 #include "content/public/browser/gpu_data_manager_observer.h"
 #include "gpu/command_buffer/service/gpu_switches.h"
 #include "gpu/config/gpu_feature_type.h"
 #include "gpu/config/gpu_info.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "url/gurl.h"
 
+#if defined(OS_WIN)
+#include "base/win/windows_version.h"
+#endif
+
 #define LONG_STRING_CONST(...) #__VA_ARGS__
 
 namespace content {
 namespace {
 
 class TestObserver : public GpuDataManagerObserver {
  public:
   TestObserver()
       : gpu_info_updated_(false),
         video_memory_usage_stats_updated_(false) {
@@ skipping 250 matching lines @@
   EXPECT_FALSE(manager->ShouldUseSwiftShader());
 
   manager->DisableHardwareAcceleration();
   EXPECT_TRUE(manager->GpuAccessAllowed(NULL));
   EXPECT_TRUE(manager->ShouldUseSwiftShader());
   EXPECT_EQ(1u, manager->GetBlacklistedFeatureCount());
   EXPECT_TRUE(manager->IsFeatureBlacklisted(
       gpu::GPU_FEATURE_TYPE_ACCELERATED_2D_CANVAS));
 }
 
+TEST_F(GpuDataManagerImplPrivateTest, WarpEnabledOverridesSwiftShader) {
+  // If WARP fallback is enabled on Windows 8 it should not allow SwiftShader
+  // to be enabled.
+#if defined(OS_WIN)
+  if (base::win::GetVersion() >= base::win::VERSION_WIN8) {
+    ScopedGpuDataManagerImplPrivate manager;
+    manager->ForceWarpModeForTesting();
+    const base::FilePath test_path(FILE_PATH_LITERAL("AnyPath"));
+    manager->RegisterSwiftShaderPath(test_path);
+    manager->DisableHardwareAcceleration();
+    EXPECT_TRUE(manager->ShouldUseWarp());
+    EXPECT_FALSE(manager->ShouldUseSwiftShader());
+  }
+#endif
+}
+
 TEST_F(GpuDataManagerImplPrivateTest, GpuInfoUpdate) {
   ScopedGpuDataManagerImpl manager;
 
   TestObserver observer;
   manager->AddObserver(&observer);
 
   {
     base::RunLoop run_loop;
     run_loop.RunUntilIdle();
   }
@@ skipping 432 matching lines @@
   EXPECT_TRUE(manager->UpdateActiveGpu(0x8086, 0x04a1));
   {
     base::RunLoop run_loop;
     run_loop.RunUntilIdle();
   }
   EXPECT_TRUE(observer.gpu_info_updated());
   EXPECT_EQ(1u, manager->GetBlacklistedFeatureCount());
 }
 
 }  // namespace content