Support subpixel layout for borders.

third_party/WebKit/Source/core/page/SpatialNavigation.cpp

 /*
  * Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Antonio Gomes <tonikitoo@webkit.org>
  *
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
@@ skipping 401 matching lines @@
   if (node->isDocumentNode())
     return frameRectInAbsoluteCoordinates(toDocument(node)->frame());
   LayoutRect rect =
       rectToAbsoluteCoordinates(node->document().frame(), node->boundingBox());
 
   // For authors that use border instead of outline in their CSS, we compensate
   // by ignoring the border when calculating the rect of the focused element.
   if (ignoreBorder) {
     rect.move(node->layoutObject()->style()->borderLeftWidth(),
               node->layoutObject()->style()->borderTopWidth());
-    rect.setWidth(rect.width() -
-                  node->layoutObject()->style()->borderLeftWidth() -
-                  node->layoutObject()->style()->borderRightWidth());
-    rect.setHeight(rect.height() -
-                   node->layoutObject()->style()->borderTopWidth() -
-                   node->layoutObject()->style()->borderBottomWidth());
+    rect.setWidth(LayoutUnit(
+        rect.width() - node->layoutObject()->style()->borderLeftWidth() -
+        node->layoutObject()->style()->borderRightWidth()));
+    rect.setHeight(LayoutUnit(
+        rect.height() - node->layoutObject()->style()->borderTopWidth() -
+        node->layoutObject()->style()->borderBottomWidth()));
   }
   return rect;
 }
 
 LayoutRect frameRectInAbsoluteCoordinates(LocalFrame* frame) {
   return rectToAbsoluteCoordinates(
       frame, LayoutRect(frame->view()->visibleContentRect()));
 }
 
 // This method calculates the exitPoint from the startingRect and the entryPoint
@@ skipping 245 matching lines @@
   return rect;
 }
 
 HTMLFrameOwnerElement* frameOwnerElement(FocusCandidate& candidate) {
   return candidate.isFrameOwnerElement()
              ? toHTMLFrameOwnerElement(candidate.visibleNode)
              : nullptr;
 };
 
 }  // namespace blink