Make CaretBase a DisplayItemClient.

third_party/WebKit/Source/core/layout/LayoutObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 1100 matching lines @@
     // Non-composited scrolling should be included in the bounds of scrolled items. Since mapToVisualRectInAncestorSpace does not include
     // scrolling of the ancestor, we need to add it back in after.
     if (paintInvalidationContainer.isBox() && !paintInvalidationContainer.usesCompositedScrolling() && this != &paintInvalidationContainer) {
         const LayoutBox* box = toLayoutBox(&paintInvalidationContainer);
         if (box->hasOverflowClip())
             return -box->scrolledContentOffset();
     }
     return IntSize();
 }
 
-void LayoutObject::invalidatePaintRectangle(const LayoutRect& dirtyRect, DisplayItemClient* displayItemClient) const
+LayoutRect LayoutObject::invalidatePaintRectangle(const LayoutRect& dirtyRect, DisplayItemClient* displayItemClient) const
 {
-    ObjectPaintInvalidator(*this).invalidatePaintRectangle(dirtyRect, displayItemClient);
+    return ObjectPaintInvalidator(*this).invalidatePaintRectangle(dirtyRect, displayItemClient);
 }
 
 void LayoutObject::invalidateTreeIfNeeded(const PaintInvalidationState& paintInvalidationState)
 {
     ensureIsReadyForPaintInvalidation();
 
     // If we didn't need paint invalidation then our children don't need as well.
     // Skip walking down the tree as everything should be fine below us.
     if (!shouldCheckForPaintInvalidation(paintInvalidationState))
         return;
@@ skipping 2098 matching lines @@
         const blink::LayoutObject* root = object1;
         while (root->parent())
             root = root->parent();
         root->showLayoutTreeAndMark(object1, "*", object2, "-", 0);
     } else {
         WTFLogAlways("%s", "Cannot showLayoutTree. Root is (nil)");
     }
 }
 
 #endif