add support for forcing compositing mode

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 164 matching lines @@
 extern const char kExperimentalSpellcheckerFeatures[];
 extern const char kExplicitlyAllowedPorts[];
 extern const char kExtensionsUpdateFrequency[];
 extern const char kFlagSwitchesBegin[];
 extern const char kFlagSwitchesEnd[];
 extern const char kFeedbackServer[];
 extern const char kFileDescriptorLimit[];
 extern const char kFocusExistingTabOnOpen[];
 extern const char kFirstRun[];
 extern const char kForceAppsPromoVisible[];
+extern const char kForceCompositingMode[];
 extern const char kForceFieldTestNameAndValue[];
 extern const char kForceRendererAccessibility[];
 extern const char kForceStubLibcros[];
 extern const char kGSSAPILibraryName[];
 extern const char kHelp[];
 extern const char kHelpShort[];
 extern const char kHideIcons[];
 extern const char kHomePage[];
 extern const char kHostRules[];
 extern const char kHostResolverParallelism[];
@@ skipping 164 matching lines @@
 #if defined(HAVE_XINPUT2)
 extern const char kTouchDevices[];
 #endif
 
 // 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_