Add development Blink setting for impl-side rubber-banding

Source/web/WebSettingsImpl.cpp

Index: Source/web/WebSettingsImpl.cpp
diff --git a/Source/web/WebSettingsImpl.cpp b/Source/web/WebSettingsImpl.cpp
index 9e4ace5021e780707af9795380e914fb0f18b508..512f266c001a2980a44b2d1fcf4573d9adea8eee 100644
--- a/Source/web/WebSettingsImpl.cpp
+++ b/Source/web/WebSettingsImpl.cpp
@@ -251,6 +251,11 @@ void WebSettingsImpl::setRootLayerScrolls(bool rootLayerScrolls)
     m_settings->setRootLayerScrolls(rootLayerScrolls);
 }
 
+void WebSettingsImpl::setRubberBandingOnCompositorThread(bool rubberBandingOnCompositorThread)
+{
+    m_settings->setRubberBandingOnCompositorThread(rubberBandingOnCompositorThread);
+}
+
 void WebSettingsImpl::setClobberUserAgentInitialScaleQuirk(bool clobberUserAgentInitialScaleQuirk)
 {
     m_clobberUserAgentInitialScaleQuirk = clobberUserAgentInitialScaleQuirk;