cc: Make the TileManager operate on ManagedTileState directly

cc/tile.cc

Index: cc/tile.cc
diff --git a/cc/tile.cc b/cc/tile.cc
index 1f750cbde7fb9fad9b9145fc1560c8320a887825..7c6a58fbbbf68c5aa56e8bdc7634db8583925745 100644
--- a/cc/tile.cc
+++ b/cc/tile.cc
@@ -23,12 +23,12 @@ Tile::Tile(TileManager* tile_manager,
     format_(format),
     content_rect_(content_rect),
     opaque_rect_(opaque_rect),
-    contents_scale_(contents_scale) {
-  tile_manager_->RegisterTile(this);
+    contents_scale_(contents_scale),
+    managed_state_(NULL) {
 }
 
 Tile::~Tile() {
-  tile_manager_->UnregisterTile(this);
+  DCHECK(!managed_state_);
 }
 
 scoped_ptr<base::Value> Tile::AsValue() const {
@@ -39,7 +39,7 @@ scoped_ptr<base::Value> Tile::AsValue() const {
   res->SetDouble("contents_scale", contents_scale_);
   res->Set("priority.0", priority_[ACTIVE_TREE].AsValue().release());
   res->Set("priority.1", priority_[PENDING_TREE].AsValue().release());
-  res->Set("managed_state", managed_state_.AsValue().release());
+  res->Set("managed_state", managed_state_->AsValue().release());
   return res.PassAs<base::Value>();
 }