Fixed position layer counter-scroll with main thread scroll offset fractional part

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 f73ae10429e1174f3c2dc83bd41be82bb1b158f3..36913b9dadb2e8c42a322cf501d28bf38f55d246 100644
--- a/cc/blink/web_layer_impl.cc
+++ b/cc/blink/web_layer_impl.cc
@@ -273,6 +273,11 @@ void WebLayerImpl::setScrollPositionDouble(blink::WebDoublePoint position) {
   layer_->SetScrollOffset(gfx::ScrollOffset(position.x, position.y));
 }
 
+void WebLayerImpl::setScrollPositionFractionalPart(
+    blink::WebDoublePoint position) {
+  layer_->SetScrollOffsetFractionalPart(gfx::Vector2dF(position.x, position.y));
+}
+
 blink::WebDoublePoint WebLayerImpl::scrollPositionDouble() const {
   return blink::WebDoublePoint(layer_->scroll_offset().x(),
                                layer_->scroll_offset().y());