Revert of Remove --enable-per-tile-painting and --ui-enable-per-tile-painting.

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 <algorithm>
 #include <iterator>
 #include <map>
 #include <set>
@@ skipping 871 matching lines @@
     SINGLE_VALUE_TYPE(switches::kDisableOpusPlayback)
   },
  {
     "disable-vp8-alpha-playback",
     IDS_FLAGS_DISABLE_VP8_ALPHA_PLAYBACK_NAME,
     IDS_FLAGS_DISABLE_VP8_ALPHA_PLAYBACK_DESCRIPTION,
     kOsDesktop,
     SINGLE_VALUE_TYPE(switches::kDisableVp8AlphaPlayback)
   },
   {
+    "per-tile-painting",
+    IDS_FLAGS_PER_TILE_PAINTING_NAME,
+    IDS_FLAGS_PER_TILE_PAINTING_DESCRIPTION,
+    kOsMac | kOsLinux | kOsCrOS,
+    SINGLE_VALUE_TYPE(cc::switches::kEnablePerTilePainting)
+  },
+  {
     "enable-javascript-harmony",
     IDS_FLAGS_ENABLE_JAVASCRIPT_HARMONY_NAME,
     IDS_FLAGS_ENABLE_JAVASCRIPT_HARMONY_DESCRIPTION,
     kOsAll,
     SINGLE_VALUE_TYPE_AND_VALUE(switches::kJavaScriptFlags, "--harmony")
   },
   {
     "disable-restore-session-state",
     IDS_FLAGS_DISABLE_RESTORE_SESSION_STATE_NAME,
     IDS_FLAGS_DISABLE_RESTORE_SESSION_STATE_DESCRIPTION,
@@ skipping 1604 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags