Re-land: cc: Use worker context for one-copy tile initialization.

cc/tiles/tile_manager.cc

Index: cc/tiles/tile_manager.cc
diff --git a/cc/tiles/tile_manager.cc b/cc/tiles/tile_manager.cc
index 23d2eca12bc23f35ee754226ba18be01066341ca..7e70ae203d5d3bb81ab6127c1aece49480559db1 100644
--- a/cc/tiles/tile_manager.cc
+++ b/cc/tiles/tile_manager.cc
@@ -541,7 +541,7 @@ void TileManager::AssignGpuMemoryToTiles(
   // or deleted. If this operation becomes expensive too, only do this after
   // some resource(s) was returned. Note that in that case, one also need to
   // invalidate when releasing some resource from the pool.
-  resource_pool_->CheckBusyResources(false);
+  resource_pool_->CheckBusyResources();
 
   // Now give memory out to the tiles until we're out, and build
   // the needs-to-be-rasterized queue.