cc: Rework tiling set eviction iterator.

cc/resources/picture_layer_tiling_set.h

 // Copyright 2012 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 CC_RESOURCES_PICTURE_LAYER_TILING_SET_H_
 #define CC_RESOURCES_PICTURE_LAYER_TILING_SET_H_
 
 #include <set>
 #include <vector>
 
@@ skipping 13 matching lines @@
 class CC_EXPORT PictureLayerTilingSet {
  public:
   enum TilingRangeType {
     HIGHER_THAN_HIGH_RES,
     HIGH_RES,
     BETWEEN_HIGH_AND_LOW_RES,
     LOW_RES,
     LOWER_THAN_LOW_RES
   };
   struct TilingRange {
-    TilingRange(size_t start, size_t end) : start(start), end(end) {}
+    TilingRange(int start, int end) : start(start), end(end) {}
 
-    size_t start;
-    size_t end;
+    int start;
+    int end;
   };
 
   static scoped_ptr<PictureLayerTilingSet> Create(
       PictureLayerTilingClient* client,
       size_t max_tiles_for_interest_area,
       float skewport_target_time_in_seconds,
       int skewport_extrapolation_limit_in_content);
 
   ~PictureLayerTilingSet();
 
@@ skipping 144 matching lines @@
   const int skewport_extrapolation_limit_in_content_pixels_;
   PictureLayerTilingClient* client_;
 
   friend class Iterator;
   DISALLOW_COPY_AND_ASSIGN(PictureLayerTilingSet);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_PICTURE_LAYER_TILING_SET_H_