Raster PictureLayerTiling with fractional translation

cc/tiles/picture_layer_tiling.h

Index: cc/tiles/picture_layer_tiling.h
diff --git a/cc/tiles/picture_layer_tiling.h b/cc/tiles/picture_layer_tiling.h
index fcd06ace8cd20025ba207cfd4e22593ac392a40c..c9634dfbc37e356811ef8a1273d9c83e91508bf1 100644
--- a/cc/tiles/picture_layer_tiling.h
+++ b/cc/tiles/picture_layer_tiling.h
@@ -82,6 +82,7 @@ class CC_EXPORT PictureLayerTiling {
 
   PictureLayerTiling(WhichTree tree,
                      float contents_scale,
+                     const gfx::Vector2dF& contents_translation,
                      scoped_refptr<RasterSource> raster_source,
                      PictureLayerTilingClient* client);
   ~PictureLayerTiling();
@@ -119,6 +120,9 @@ class CC_EXPORT PictureLayerTiling {
   gfx::Rect live_tiles_rect() const { return live_tiles_rect_; }
   gfx::Size tile_size() const { return tiling_data_.max_texture_size(); }
   float contents_scale() const { return contents_scale_; }
+  const gfx::Vector2dF& contents_translation() const {
+    return contents_translation_;
+  }
   const TilingData* tiling_data() const { return &tiling_data_; }
 
   Tile* TileAt(int i, int j) const {
@@ -319,8 +323,14 @@ class CC_EXPORT PictureLayerTiling {
   }
   void RemoveTilesInRegion(const Region& layer_region, bool recreate_tiles);
 
+  gfx::Rect EnclosingContentsRectFromLayerRect(
+      const gfx::Rect& layer_rect) const;
+  gfx::Rect EnclosingLayerRectFromContentsRect(
+      const gfx::Rect& contents_rect) const;
+
   // Given properties.
   const float contents_scale_;
+  const gfx::Vector2dF contents_translation_;
   PictureLayerTilingClient* const client_;
   const WhichTree tree_;
   scoped_refptr<RasterSource> raster_source_;