Update scroll layer positions in WebLayerImpl

webkit/renderer/compositor_bindings/web_layer_impl.cc

Index: webkit/renderer/compositor_bindings/web_layer_impl.cc
diff --git a/webkit/renderer/compositor_bindings/web_layer_impl.cc b/webkit/renderer/compositor_bindings/web_layer_impl.cc
index 4f3a3b8a93e5666641c4f458aff90459f31f37a8..c8ea7c35a469c2317f3779b66b5d5ce76f27ab91 100644
--- a/webkit/renderer/compositor_bindings/web_layer_impl.cc
+++ b/webkit/renderer/compositor_bindings/web_layer_impl.cc
@@ -227,6 +227,11 @@ void WebLayerImpl::setForceRenderSurface(bool force_render_surface) {
 
 void WebLayerImpl::setScrollPosition(WebKit::WebPoint position) {
   layer_->SetScrollOffset(gfx::Point(position).OffsetFromOrigin());
+  // TODO(enne): Blink currently always updates scroll offset and layer position
+  // in tandem for frames in RenderLayerCompositor::frameViewDidScroll.
+  // So that this can be removed in Blink, temporarily do that work here.
+  // See: http://crbug.com/256381
+  layer_->SetPosition(gfx::PointAtOffsetFromOrigin(-layer_->scroll_offset()));
 }
 
 WebKit::WebPoint WebLayerImpl::scrollPosition() const {