Add a command line flag (--enable-fixed-position-compositing) for enabling compositing

content/public/common/content_switches.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 "content/public/common/content_switches.h"
 
 namespace switches {
 
 // By default, file:// URIs cannot read other file:// URIs. This is an
 // override for developers who need the old behavior for testing.
@@ skipping 163 matching lines @@
 // SKIA_GPU flag, which can be enabled by setting use_skia_gpu variable to 1
 // in build/features_override.gypi.
 const char kEnableAcceleratedDrawing[]      = "enable-accelerated-drawing";
 
 // Enables WebKit accessibility within the renderer process.
 const char kEnableAccessibility[]           = "enable-accessibility";
 
 // Turns on extremely verbose logging of accessibility events.
 const char kEnableAccessibilityLogging[]    = "enable-accessibility-logging";
 
+// Enables the creation of compositing layers for fixed position elements.
+const char kEnableCompositingForFixedPosition[] =
+     "enable-fixed-position-compositing";
+
 // Enable DNS side checking of certificates. Still experimental, should only
 // be used by developers at the current time.
 const char kEnableDNSCertProvenanceChecking[] =
      "enable-dns-cert-provenance-checking";
 
 // Enables device motion events.
 const char kEnableDeviceMotion[]            = "enable-device-motion";
 
 // Enable the JavaScript Full Screen API.
 const char kDisableFullScreen[]             = "disable-fullscreen";
@@ skipping 309 matching lines @@
 // instead of NSS for SSL.
 const char kUseSystemSSL[]                  = "use-system-ssl";
 #endif
 
 #if !defined(OFFICIAL_BUILD)
 // Causes the renderer process to throw an assertion on launch.
 const char kRendererCheckFalseTest[]        = "renderer-check-false-test";
 #endif
 
 }  // namespace switches