Make window.scroll properties relative to the layout viewport.

third_party/WebKit/Source/web/WebSettingsImpl.cpp

Index: third_party/WebKit/Source/web/WebSettingsImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebSettingsImpl.cpp b/third_party/WebKit/Source/web/WebSettingsImpl.cpp
index b392cb8b1a9503cc540bc4983efc305c75c931e5..b83e8a409bae4e771c4754d9938b0bbf6fcf3867 100644
--- a/third_party/WebKit/Source/web/WebSettingsImpl.cpp
+++ b/third_party/WebKit/Source/web/WebSettingsImpl.cpp
@@ -190,6 +190,11 @@ void WebSettingsImpl::setInvertViewportScrollOrder(bool enabled)
     m_settings->setInvertViewportScrollOrder(enabled);
 }
 
+void WebSettingsImpl::setInertVisualViewport(bool enabled)
+{
+    m_settings->setInertVisualViewport(enabled);
+}
+
 void WebSettingsImpl::setDeviceScaleAdjustment(float deviceScaleAdjustment)
 {
     m_devToolsEmulator->setDeviceScaleAdjustment(deviceScaleAdjustment);