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

chrome/common/chrome_switches.h

 // 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.
 
 // Defines all the command-line switches used by Chrome.
 
 #ifndef CHROME_COMMON_CHROME_SWITCHES_H_
 #define CHROME_COMMON_CHROME_SWITCHES_H_
 #pragma once
 
@@ skipping 297 matching lines @@
 extern const char kSbInfoURLPrefix[];
 extern const char kSbMacKeyURLPrefix[];
 extern const char kSbDisableAutoUpdate[];
 extern const char kSbEnableDownloadProtection[];
 extern const char kSbEnableDownloadWarningUI[];
 extern const char kSdchFilter[];
 extern const char kSearchInOmniboxHint[];
 extern const char kServiceProcess[];
 extern const char kServiceAccountLsid[];
 extern const char kShowCompositedLayerBorders[];
+extern const char kShowCompositedLayerTree[];
+extern const char kShowFPSCounter[];
 extern const char kShowIcons[];
 extern const char kShowPaintRects[];
 extern const char kSilentDumpOnDCHECK[];
 extern const char kSimpleDataSource[];
 extern const char kSingleProcess[];
 extern const char kStartMaximized[];
 extern const char kSyncAllowInsecureXmppConnection[];
 extern const char kSyncInvalidateXmppLogin[];
 extern const char kSyncerThreadTimedStop[];
 extern const char kSyncNotificationMethod[];
@@ skipping 110 matching lines @@
 
 // Return true if the switches indicate the seccomp sandbox is enabled.
 bool SeccompSandboxEnabled();
 
 // DON'T ADD RANDOM STUFF HERE. Put it in the main section above in
 // alphabetical order, or in one of the ifdefs (also in order in each section).
 
 }  // namespace switches
 
 #endif  // CHROME_COMMON_CHROME_SWITCHES_H_