cc: Fix numbers that we report to the HUD

cc/resources/tile_manager.cc

Index: cc/resources/tile_manager.cc
diff --git a/cc/resources/tile_manager.cc b/cc/resources/tile_manager.cc
index 38948c3fa1ab921b01864c448fb5e7fb3d74ee65..d8fb17d5b5c3d1e93c893b1903b6f89aba9066ae 100644
--- a/cc/resources/tile_manager.cc
+++ b/cc/resources/tile_manager.cc
@@ -963,7 +963,7 @@ void TileManager::AssignGpuMemoryToTiles(
   memory_stats_from_last_assign_.bytes_allocated =
       hard_bytes_allocatable - hard_bytes_left;
   memory_stats_from_last_assign_.bytes_unreleasable =
-      hard_bytes_allocatable - bytes_releasable_;
+      resource_pool_->acquired_memory_usage_bytes() - bytes_releasable_;
   memory_stats_from_last_assign_.bytes_over = bytes_that_exceeded_memory_budget;
 }