Add a flag for enabling/disabling the new accelerated scrolling path

content/public/common/content_switches.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 "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 271 matching lines @@
 
 // Disable False Start in SSL and TLS connections.
 const char kDisableSSLFalseStart[]          = "disable-ssl-false-start";
 
 // Disable multithreaded GPU compositing of web content.
 const char kDisableThreadedCompositing[]     = "disable-threaded-compositing";
 
 // Disables the threaded HTML parser in Blink
 const char kDisableThreadedHTMLParser[]     = "disable-threaded-html-parser";
 
+// Disable accelerated overflow scrolling in corner cases (that would not be
+// handled by enable-accelerated-overflow-scroll).
+const char kDisableUniversalAcceleratedOverflowScroll[] =
+    "disable-universal-accelerated-overflow-scroll";
+
 // Disable web audio API.
 const char kDisableWebAudio[]               = "disable-webaudio";
 
 // Disables prefixed Media Source API (i.e., the WebKitMediaSource object).
 const char kDisableWebKitMediaSource[]      = "disable-webkit-media-source";
 
 // Disables unprefixed Media Source API (i.e., the MediaSource object).
 const char kDisableUnprefixedMediaSource[]  = "disable-unprefixed-media-source";
 
 // Don't enforce the same-origin policy. (Used by people testing their sites.)
@@ skipping 229 matching lines @@
 // SYN packet.
 const char kEnableTcpFastOpen[]             = "enable-tcp-fastopen";
 
 // Enable Text Service Framework(TSF) for text inputting instead of IMM32. This
 // flag is ignored on Metro environment.
 const char kEnableTextServicesFramework[]   = "enable-text-services-framework";
 
 // Enable multithreaded GPU compositing of web content.
 const char kEnableThreadedCompositing[]     = "enable-threaded-compositing";
 
+// Enable accelerated overflow scrolling in all cases.
+const char kEnableUniversalAcceleratedOverflowScroll[] =
+    "enable-universal-accelerated-overflow-scroll";
+
 // Enable screen capturing support for MediaStream API.
 const char kEnableUserMediaScreenCapturing[] =
     "enable-usermedia-screen-capturing";
 
 // Enables the use of the viewport meta tag, which allows
 // pages to control aspects of their own layout. This also turns on touch-screen
 // pinch gestures.
 const char kEnableViewport[]                = "enable-viewport";
 
 // Enables moving cursor by word in visual order.
@@ skipping 436 matching lines @@
 #endif
 
 #if defined(USE_AURA)
 // Forces usage of the test compositor. Needed to run ui tests on bots.
 extern const char kTestCompositor[]         = "test-compositor";
 #endif
 
 // Don't dump stuff here, follow the same order as the header.
 
 }  // namespace switches