cc: Fix bugs found by fuzzer due to floating point imprecision.

cc/tiles/picture_layer_tiling.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_TILES_PICTURE_LAYER_TILING_H_
 #define CC_TILES_PICTURE_LAYER_TILING_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 219 matching lines @@
     Tile* operator->() const { return current_tile_; }
     Tile* operator*() const { return current_tile_; }
 
     CoverageIterator& operator++();
     operator bool() const { return tile_j_ <= bottom_; }
 
     int i() const { return tile_i_; }
     int j() const { return tile_j_; }
 
    private:
+    gfx::Rect ComputeGeometryRect() const;
+
     const PictureLayerTiling* tiling_ = nullptr;
     gfx::Size coverage_rect_max_bounds_;
     gfx::Rect coverage_rect_;
     gfx::AxisTransform2d coverage_to_content_;
 
     Tile* current_tile_ = nullptr;
     gfx::Rect current_geometry_rect_;
     int tile_i_ = 0;
     int tile_j_ = 0;
     int left_ = 0;
@@ skipping 138 matching lines @@
   bool has_eventually_rect_tiles_ = false;
   bool all_tiles_done_ = true;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(PictureLayerTiling);
 };
 
 }  // namespace cc
 
 #endif  // CC_TILES_PICTURE_LAYER_TILING_H_