Merge 210713 "cc: Remove tile ref counting in tile manager."

cc/resources/tile.h

Index: cc/resources/tile.h
===================================================================
--- cc/resources/tile.h	(revision 211727)
+++ cc/resources/tile.h	(working copy)
@@ -17,10 +17,11 @@
 namespace cc {
 
 class PicturePileImpl;
-class Tile;
 
 class CC_EXPORT Tile : public base::RefCounted<Tile> {
  public:
+  typedef uint64 Id;
+
   Tile(TileManager* tile_manager,
        PicturePileImpl* picture_pile,
        gfx::Size tile_size,
@@ -30,6 +31,10 @@
        int layer_id,
        int source_frame_number);
 
+  Id id() const {
+    return id_;
+  }
+
   PicturePileImpl* picture_pile() {
     return picture_pile_.get();
   }
@@ -143,6 +148,9 @@
   int layer_id_;
   int source_frame_number_;
 
+  Id id_;
+  static Id s_next_id_;
+
   DISALLOW_COPY_AND_ASSIGN(Tile);
 };