Move visual rect unioning between paired items to cc::DisplayItemList.

ui/compositor/clip_recorder.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 UI_COMPOSITOR_CLIP_RECORDER_H_
 #define UI_COMPOSITOR_CLIP_RECORDER_H_
 
 #include "base/macros.h"
 #include "ui/compositor/compositor_export.h"
 #include "ui/gfx/geometry/rect.h"
 
 namespace cc {
 class DisplayItem;
 class DisplayItemList;
 }
 
 namespace gfx {
 class Path;
-class Size;
 }
 
 namespace ui {
 class PaintContext;
 
 // A class to provide scoped clips of painting to a DisplayItemList. The clip
 // provided will be applied to any DisplayItems added to the DisplayItemList
 // while this object is alive. In other words, any nested recorders will be
 // clipped.
 class COMPOSITOR_EXPORT ClipRecorder {
  public:
   explicit ClipRecorder(const PaintContext& context);
   ~ClipRecorder();
 
   void ClipRect(const gfx::Rect& clip_rect);
   void ClipPath(const gfx::Path& clip_path);
   void ClipPathWithAntiAliasing(const gfx::Path& clip_path);
 
  private:
   enum Closer {
     CLIP_RECT,
     CLIP_PATH,
   };
 
-  void RecordCloser(const gfx::Rect& bounds_in_layer, Closer);
+  void RecordCloser(Closer);
 
   const PaintContext& context_;
   // If someone needs to do more than this many operations with a single
   // ClipRecorder then we'll increase this.
   enum : int { kMaxOpCount = 4 };
   Closer closers_[kMaxOpCount];
-  gfx::Rect bounds_in_layer_[kMaxOpCount];
   int num_closers_;
 
   DISALLOW_COPY_AND_ASSIGN(ClipRecorder);
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_CLIP_RECORDER_H_