Revert of Remove EnableThreadedCompositing from the browser.

content/browser/gpu/compositor_util_browsertest.cc

 // Copyright 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/public/test/content_browser_test.h"
 
 #if defined(OS_MACOSX)
 #include "base/mac/mac_util.h"
 #elif defined(OS_WIN)
 #include "base/win/windows_version.h"
 #endif
 
 namespace content {
 
 typedef ContentBrowserTest CompositorUtilTest;
 
-// Test that compositing is in the expected mode on the bots for all platforms.
+// 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 {
-    DIRECT,
-    DELEGATED,
-  } expected_mode = DIRECT;
-#if defined(USE_AURA) || defined(OS_ANDROID)
+    DISABLED,
+    ENABLED,
+    THREADED,  // Implies FCM
+    DELEGATED,  // Implies threaded
+  } expected_mode = DISABLED;
+#if defined(USE_AURA)
+  expected_mode = DELEGATED;
+#elif defined(OS_ANDROID)
   expected_mode = DELEGATED;
 #elif defined(OS_MACOSX)
-  expected_mode = DIRECT;
+  expected_mode = THREADED;
+  // Lion and SnowLeopard have compositing blacklisted when using the Apple
+  // software renderer, so results will vary depending if this test is being
+  // run in a VM versus actual hardware.
+  // http://crbug.com/230931
+  if (base::mac::IsOSLionOrEarlier())
+    return;
+#elif defined(OS_WIN)
+  if (base::win::GetVersion() >= base::win::VERSION_VISTA)
+    expected_mode = THREADED;
 #endif
 
-  EXPECT_EQ(expected_mode == DELEGATED, IsDelegatedRendererEnabled());
+  EXPECT_EQ(expected_mode == THREADED ||
+            expected_mode == DELEGATED,
+            IsThreadedCompositingEnabled());
+  EXPECT_EQ(expected_mode == DELEGATED,
+            IsDelegatedRendererEnabled());
 }
 
 }