Revert of Remove invert viewport scroll order setting from Blink

third_party/WebKit/Source/core/frame/VisualViewport.cpp

Index: third_party/WebKit/Source/core/frame/VisualViewport.cpp
diff --git a/third_party/WebKit/Source/core/frame/VisualViewport.cpp b/third_party/WebKit/Source/core/frame/VisualViewport.cpp
index 27d28a57431ab7d5584dcbb09901899c7f6e79c9..b13c3b0c43bfa85d046121437ee380efda5b999e 100644
--- a/third_party/WebKit/Source/core/frame/VisualViewport.cpp
+++ b/third_party/WebKit/Source/core/frame/VisualViewport.cpp
@@ -253,6 +253,14 @@
     // First try to use the anchor's delta to scroll the FrameView.
     FloatSize anchorDeltaUnusedByScroll = anchorDelta;
 
+    if (!frameHost().settings().invertViewportScrollOrder()) {
+        FrameView* view = mainFrame()->view();
+        DoublePoint oldPosition = view->scrollPositionDouble();
+        view->scrollBy(DoubleSize(anchorDelta.width(), anchorDelta.height()), UserScroll);
+        DoublePoint newPosition = view->scrollPositionDouble();
+        anchorDeltaUnusedByScroll -= toFloatSize(newPosition - oldPosition);
+    }
+
     // Manually bubble any remaining anchor delta up to the visual viewport.
     FloatPoint newLocation(location() + anchorDeltaUnusedByScroll);
     setScaleAndLocation(newPageScale, newLocation);