Revert of Remove EnableThreadedCompositing from the browser.

chrome/browser/about_flags.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 "chrome/browser/about_flags.h"
 
 #include <iterator>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 485 matching lines @@
 // When adding a new choice, add it to the end of the list.
 const Experiment kExperiments[] = {
   {
     "ignore-gpu-blacklist",
     IDS_FLAGS_IGNORE_GPU_BLACKLIST_NAME,
     IDS_FLAGS_IGNORE_GPU_BLACKLIST_DESCRIPTION,
     kOsAll,
     SINGLE_VALUE_TYPE(switches::kIgnoreGpuBlacklist)
   },
   {
+    "threaded-compositing-mode",
+    IDS_FLAGS_THREADED_COMPOSITING_MODE_NAME,
+    IDS_FLAGS_THREADED_COMPOSITING_MODE_DESCRIPTION,
+#if !defined(USE_AURA)
+    kOsLinux,
+#else
+    0,
+#endif
+    ENABLE_DISABLE_VALUE_TYPE(switches::kEnableThreadedCompositing,
+                              switches::kDisableThreadedCompositing)
+  },
+  {
     "force-accelerated-composited-scrolling",
      IDS_FLAGS_FORCE_ACCELERATED_OVERFLOW_SCROLL_MODE_NAME,
      IDS_FLAGS_FORCE_ACCELERATED_OVERFLOW_SCROLL_MODE_DESCRIPTION,
      kOsAll,
      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableAcceleratedOverflowScroll,
                                switches::kDisableAcceleratedOverflowScroll)
   },
   {
     "disable_layer_squashing",
     IDS_FLAGS_DISABLE_LAYER_SQUASHING_NAME,
@@ skipping 1926 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags