Paint carets at pixel-snapped positions.

third_party/WebKit/Source/core/editing/CaretBase.cpp

 /*
  * Copyright (C) 2004, 2008, 2009, 2010 Apple Inc. 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
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 199 matching lines @@
 
     Element* element;
     if (node->isElementNode())
         element = toElement(node);
     else
         element = node->parentElement();
 
     if (element && element->layoutObject())
         caretColor = element->layoutObject()->resolveColor(CSSPropertyColor);
 
-    DrawingRecorder drawingRecorder(context, *this, DisplayItem::kCaret, FloatRect(drawingRect));
-
-    context.fillRect(FloatRect(drawingRect), caretColor);
+    IntRect paintRect = pixelSnappedIntRect(drawingRect);
+    DrawingRecorder drawingRecorder(context, *this, DisplayItem::kCaret, paintRect);
+    context.fillRect(paintRect, caretColor);
 }
 
 void CaretBase::setCaretVisibility(CaretVisibility visibility)
 {
     m_caretVisibility = visibility;
 }
 
 String CaretBase::debugName() const
 {
     return "Caret";
 }
 
 LayoutRect CaretBase::visualRect() const
 {
     return m_visualRect;
 }
 
 } // namespace blink