Introduce PaintPropertyTreeBuilderFragmentContext and use it throughout.

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 19 matching lines @@
 
   // Invalidates paint-layer painting optimizations, such as subsequence caching
   // and empty paint phase optimizations if clips from the context have changed.
   ALWAYS_INLINE void InvalidatePaintLayerOptimizationsIfNeeded(
       const LayoutObject&,
       PrePaintTreeWalkContext&);
 
   // Returns the clip applied to children for the given containing block context
   // + effect, in the space of ancestorState adjusted by ancestorPaintOffset.
   ALWAYS_INLINE LayoutRect ComputeClipRectForContext(
-      const PaintPropertyTreeBuilderContext::ContainingBlockContext&,
+      const PaintPropertyTreeBuilderFragmentContext::ContainingBlockContext&,
       const EffectPaintPropertyNode*,
       const PropertyTreeState& ancestor_state,
       const LayoutPoint& ancestor_paint_offset);
 
   bool ALWAYS_INLINE
   NeedsTreeBuilderContextUpdate(const FrameView&,
                                 const PrePaintTreeWalkContext&);
   bool ALWAYS_INLINE
   NeedsTreeBuilderContextUpdate(const LayoutObject&,
                                 const PrePaintTreeWalkContext&);
 
   PaintPropertyTreeBuilder property_tree_builder_;
   PaintInvalidator paint_invalidator_;
 };
 
 }  // namespace blink
 
 #endif  // PrePaintTreeWalk_h