Add command line switches and about:flag to enable FPS indicator and compositor layer tree.

chrome/browser/about_flags.cc

 // Copyright (c) 2011 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 137 matching lines @@
     SINGLE_VALUE_TYPE(switches::kEnableCrxlessWebApps)
   },
   {
     "composited-layer-borders",
     IDS_FLAGS_COMPOSITED_LAYER_BORDERS,
     IDS_FLAGS_COMPOSITED_LAYER_BORDERS_DESCRIPTION,
     kOsAll,
     SINGLE_VALUE_TYPE(switches::kShowCompositedLayerBorders)
   },
   {
+    "show-fps-counter",
+    IDS_FLAGS_SHOW_FPS_COUNTER,
+    IDS_FLAGS_SHOW_FPS_COUNTER_DESCRIPTION,
+    kOsAll,
+    SINGLE_VALUE_TYPE(switches::kShowFPSCounter)
+  },
+  {
     "gpu-canvas-2d",  // FLAGS:RECORD_UMA
     IDS_FLAGS_ACCELERATED_CANVAS_2D_NAME,
     IDS_FLAGS_ACCELERATED_CANVAS_2D_DESCRIPTION,
     kOsWin | kOsLinux | kOsCrOS,
     SINGLE_VALUE_TYPE(switches::kEnableAccelerated2dCanvas)
   },
   // FIXME(scheib): Add Flags entry for WebGL,
   // or pull it and the strings in generated_resources.grd by Dec 2010
   // {
   //   "webgl",
@@ skipping 517 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags