cc: Start using raster/eviction iterators.

cc/base/tiling_data.cc

Index: cc/base/tiling_data.cc
diff --git a/cc/base/tiling_data.cc b/cc/base/tiling_data.cc
index 185bbed40198f6f6c63fb2594acb7d38578a9fd6..c477c212f783104636a4d4045d8dd0365a20af89 100644
--- a/cc/base/tiling_data.cc
+++ b/cc/base/tiling_data.cc
@@ -488,15 +488,16 @@ TilingData::SpiralDifferenceIterator::SpiralDifferenceIterator(
   }
 
   gfx::Rect consider(consider_rect);
-  gfx::Rect ignore(ignore_rect);
-  gfx::Rect center(center_rect);
   consider.Intersect(tiling_data_->tiling_rect());
-  ignore.Intersect(tiling_data_->tiling_rect());
   if (consider.IsEmpty()) {
     done();
     return;
   }
 
+  gfx::Rect center(center_rect);
+  gfx::Rect ignore(ignore_rect);
+  ignore.Intersect(tiling_data_->tiling_rect());
+
   consider_left_ =
       tiling_data_->FirstBorderTileXIndexFromSrcCoord(consider.x());
   consider_top_ = tiling_data_->FirstBorderTileYIndexFromSrcCoord(consider.y());