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

cc/resources/tile.cc

Index: cc/resources/tile.cc
===================================================================
--- cc/resources/tile.cc	(revision 211727)
+++ cc/resources/tile.cc	(working copy)
@@ -10,6 +10,8 @@
 
 namespace cc {
 
+Tile::Id Tile::s_next_id_ = 0;
+
 Tile::Tile(TileManager* tile_manager,
            PicturePileImpl* picture_pile,
            gfx::Size tile_size,
@@ -24,7 +26,8 @@
     contents_scale_(contents_scale),
     opaque_rect_(opaque_rect),
     layer_id_(layer_id),
-    source_frame_number_(source_frame_number) {
+    source_frame_number_(source_frame_number),
+    id_(s_next_id_++) {
   set_picture_pile(picture_pile);
   tile_manager_->RegisterTile(this);
 }