Fix the overflow clip rect rounding for overflow scrolling

third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/paint/PaintPropertyTreeBuilder.h"
 
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
 #include "core/layout/LayoutInline.h"
@@ skipping 444 matching lines @@
   // apply.  However for layout purposes we do generate child layout objects for
   // them, e.g. button label.  We should clip the overflow from those children.
   // This is called control clip and we technically treat them like overflow
   // clip.
   LayoutRect clipRect;
   if (box.hasControlClip()) {
     clipRect = box.controlClipRect(context.current.paintOffset);
   } else if (box.hasOverflowClip() || box.styleRef().containsPaint() ||
              (box.isSVGRoot() &&
               toLayoutSVGRoot(box).shouldApplyViewportClip())) {
-    clipRect = box.overflowClipRect(context.current.paintOffset);
+    clipRect = LayoutRect(
+        pixelSnappedIntRect(box.overflowClipRect(context.current.paintOffset)));
   } else {
     if (auto* properties = object.getMutableForPainting().paintProperties()) {
       properties->clearInnerBorderRadiusClip();
       properties->clearOverflowClip();
     }
     return;
   }
 
   if (box.styleRef().hasBorderRadius()) {
     auto innerBorder = box.styleRef().getRoundedInnerBorderFor(
@@ skipping 314 matching lines @@
     return;
 
   updateOverflowClip(object, context);
   updatePerspective(object, context);
   updateSvgLocalToBorderBoxTransform(object, context);
   updateScrollAndScrollTranslation(object, context);
   updateOutOfFlowContext(object, context);
 }
 
 }  // namespace blink