Add a setting to do frame scrolls through the root layer.

Source/web/WebSettingsImpl.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 223 matching lines @@
 void WebSettingsImpl::setIgnoreMainFrameOverflowHiddenQuirk(bool ignoreMainFrameOverflowHiddenQuirk)
 {
     m_settings->setIgnoreMainFrameOverflowHiddenQuirk(ignoreMainFrameOverflowHiddenQuirk);
 }
 
 void WebSettingsImpl::setReportScreenSizeInPhysicalPixelsQuirk(bool reportScreenSizeInPhysicalPixelsQuirk)
 {
     m_settings->setReportScreenSizeInPhysicalPixelsQuirk(reportScreenSizeInPhysicalPixelsQuirk);
 }
 
+void WebSettingsImpl::setRootLayerScrolls(bool rootLayerScrolls)
+{
+    m_settings->setRootLayerScrolls(rootLayerScrolls);
+}
+
 void WebSettingsImpl::setClobberUserAgentInitialScaleQuirk(bool clobberUserAgentInitialScaleQuirk)
 {
     m_clobberUserAgentInitialScaleQuirk = clobberUserAgentInitialScaleQuirk;
 }
 
 void WebSettingsImpl::setSupportsMultipleWindows(bool supportsMultipleWindows)
 {
     m_settings->setSupportsMultipleWindows(supportsMultipleWindows);
 }
 
@@ skipping 472 matching lines @@
 {
     m_settings->setV8CacheOptions(static_cast<blink::V8CacheOptions>(options));
 }
 
 void WebSettingsImpl::setV8ScriptStreamingEnabled(bool enabled)
 {
     m_settings->setV8ScriptStreamingEnabled(enabled);
 }
 
 } // namespace blink