Convert some call sites to use explicit LayoutRect->FloatRect conversion.

Source/core/page/scrolling/ScrollingCoordinator.cpp

 /*
  * Copyright (C) 2011 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 485 matching lines @@
         Vector<LayoutRect>* glRects;
         if (glIter == graphicsRects.end())
             glRects = &graphicsRects.add(graphicsLayer, Vector<LayoutRect>()).storedValue->value;
         else
             glRects = &glIter->value;
 
         // Transform each rect to the co-ordinate space of the graphicsLayer.
         for (size_t i = 0; i < layerIter->value.size(); ++i) {
             LayoutRect rect = layerIter->value[i];
             if (compositedLayer != curLayer) {
-                FloatQuad compositorQuad = geometryMap.mapToContainer(rect, compositedLayer->layoutObject());
+                FloatQuad compositorQuad = geometryMap.mapToContainer(FloatRect(rect), compositedLayer->layoutObject());
                 rect = LayoutRect(compositorQuad.boundingBox());
                 // If the enclosing composited layer itself is scrolled, we have to undo the subtraction
                 // of its scroll offset since we want the offset relative to the scrolling content, not
                 // the element itself.
                 if (compositedLayer->layoutObject()->hasOverflowClip())
                     rect.move(compositedLayer->layoutBox()->scrolledContentOffset());
             }
             DeprecatedPaintLayer::mapRectToPaintBackingCoordinates(compositedLayer->layoutObject(), rect);
             glRects->append(rect);
         }
@@ skipping 559 matching lines @@
     bool frameIsScrollable = frameView && frameView->isScrollable();
     if (frameIsScrollable != m_wasFrameScrollable)
         return true;
 
     if (WebLayer* scrollLayer = frameView ? toWebLayer(frameView->layerForScrolling()) : nullptr)
         return WebSize(frameView->contentsSize()) != scrollLayer->bounds();
     return false;
 }
 
 } // namespace blink