Always enable FCM on Windows Vista+.

content/browser/gpu/compositor_util_browsertest.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 "content/browser/gpu/compositor_util.h"
+#include "content/test/content_browser_test.h"
+
+#if defined(OS_WIN)
+#include "base/win/windows_version.h"
+#endif
+
+namespace content {
+
+typedef ContentBrowserTest CompositorUtilTest;
+
+// Test that threaded compositing and FCM are in the expected mode on the bots
+// for all platforms.
+IN_PROC_BROWSER_TEST_F(CompositorUtilTest, CompositingModeAsExpected) {
+  enum CompositingMode {
+    DISABLED,
+    ENABLED,
+    THREADED,
+  } expected_mode = DISABLED;
+#if defined(OS_ANDROID) || defined(USE_AURA)
+  expected_mode = THREADED;
+#elif defined(OS_WIN)
+  if (base::win::GetVersion() >= base::win::VERSION_VISTA)
+    expected_mode = ENABLED;
+#endif
+
+  EXPECT_EQ(expected_mode == ENABLED || expected_mode == THREADED,
+            IsForceCompositingModeEnabled());
+  EXPECT_EQ(expected_mode == THREADED, IsThreadedCompositingEnabled());
+}
+
+}