Add canUpdateLayout & canHandleGestureEvent to WebViewClient.

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index 46b9d4e8b1af008c671e296a380b393545e7e76c..55d3c1eee9a7c16128b6da5741ca3d63e1deb01e 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -1827,6 +1827,14 @@ void RenderViewImpl::onMouseDown(const WebNode& mouse_down_node) {
     observer.OnMouseDown(mouse_down_node);
 }
 
+bool RenderViewImpl::canHandleGestureEvent() {
+  return true;
+}
+
+bool RenderViewImpl::canUpdateLayout() {
+  return true;
+}
+
 void RenderViewImpl::didHandleGestureEvent(
     const WebGestureEvent& event,
     bool event_cancelled) {