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

content/browser/gpu/gpu_data_manager_impl_private_unittest.cc

Index: content/browser/gpu/gpu_data_manager_impl_private_unittest.cc
diff --git a/content/browser/gpu/gpu_data_manager_impl_private_unittest.cc b/content/browser/gpu/gpu_data_manager_impl_private_unittest.cc
index 41458edb5e92e46ac016e48d14bca3788cd50af3..661e506f902532e33be48e208d9df2ce565e2a0c 100644
--- a/content/browser/gpu/gpu_data_manager_impl_private_unittest.cc
+++ b/content/browser/gpu/gpu_data_manager_impl_private_unittest.cc
@@ -14,6 +14,10 @@
 #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 {
@@ -284,6 +288,22 @@ TEST_F(GpuDataManagerImplPrivateTest, SwiftShaderRendering2) {
       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;