Implement CSS: scroll-boundary-behavior

cc/blink/web_layer_impl.cc

Index: cc/blink/web_layer_impl.cc
diff --git a/cc/blink/web_layer_impl.cc b/cc/blink/web_layer_impl.cc
index c89a657872bc8943f1ac97204872fad957261229..b16e70f31b9cdbeddd1fa3c4822ebc11f00a5282 100644
--- a/cc/blink/web_layer_impl.cc
+++ b/cc/blink/web_layer_impl.cc
@@ -39,6 +39,7 @@ using blink::WebVector;
 using blink::WebRect;
 using blink::WebSize;
 using blink::WebColor;
+using blink::WebScrollBoundaryBehavior;
 
 namespace cc_blink {
 
@@ -490,4 +491,10 @@ void WebLayerImpl::ShowScrollbars() {
   layer_->ShowScrollbars();
 }
 
+void WebLayerImpl::SetScrollBoundaryBehavior(
+    const blink::WebScrollBoundaryBehavior& behavior) {
+  layer_->SetScrollBoundaryBehavior(
+      static_cast<cc::ScrollBoundaryBehavior>(behavior));
+}
+
 }  // namespace cc_blink