Refactor to remove need for infiniteIntRect when computing rects in pre-paint

third_party/WebKit/Source/core/paint/PrePaintTreeWalk.h

 // 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.
 
 #ifndef PrePaintTreeWalk_h
 #define PrePaintTreeWalk_h
 
 #include "core/paint/ClipRect.h"
 #include "core/paint/PaintInvalidator.h"
 #include "core/paint/PaintPropertyTreeBuilder.h"
@@ skipping 22 matching lines @@
   // subsequence caching and empty paint phase optimizations,
   // if clips from the context have changed.
   void invalidatePaintLayerOptimizationsIfNeeded(
       const LayoutObject&,
       const PaintLayer& ancestorTransformedOrRootPaintLayer,
       PaintPropertyTreeBuilderContext&);
 
   // Returns the clip applied to children for the given
   // contaiing block context + effect, in the space of ancestorState adjusted
   // by ancestorPaintOffset. Sets hasClip to true if a clip was applied.
-  ClipRect clipRectForContext(
+  FloatClipRect clipRectForContext(
       const PaintPropertyTreeBuilderContext::ContainingBlockContext&,
       const EffectPaintPropertyNode*,
       const PropertyTreeState& ancestorState,
       const LayoutPoint& ancestorPaintOffset,
       bool& hasClip);
 
   PaintPropertyTreeBuilder m_propertyTreeBuilder;
   PaintInvalidator m_paintInvalidator;
   GeometryMapper& m_geometryMapper;
 };
 
 }  // namespace blink
 
 #endif  // PrePaintTreeWalk_h