Unify all types of overflow-related clips for paint and hit testing.

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/dom/DOMNodeIds.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
@@ skipping 618 matching lines @@
     return;
 
   if (object.needsPaintPropertyUpdate() || context.forceSubtreeUpdate) {
     const LayoutBox& box = toLayoutBox(object);
     // The <input> elements can't have contents thus CSS overflow property
     // doesn't 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.shouldClipOverflow()) {
+    if (box.shouldClipOverflow()) {
       clipRect = LayoutRect(pixelSnappedIntRect(
           box.overflowClipRect(context.current.paintOffset)));
     } else {
       if (auto* properties = object.getMutableForPainting().paintProperties()) {
         context.forceSubtreeUpdate |= properties->clearInnerBorderRadiusClip();
         context.forceSubtreeUpdate |= properties->clearOverflowClip();
       }
       return;
     }
 
@@ skipping 346 matching lines @@
   updateOverflowClip(object, context);
   updatePerspective(object, context);
   updateSvgLocalToBorderBoxTransform(object, context);
   updateScrollAndScrollTranslation(object, context);
   updateOutOfFlowContext(object, context);
 
   context.forceSubtreeUpdate |= object.subtreeNeedsPaintPropertyUpdate();
 }
 
 }  // namespace blink