not for commit/review (thread cost tracker)

cc/test/fake_tile_manager.h

Index: cc/test/fake_tile_manager.h
diff --git a/cc/test/fake_tile_manager.h b/cc/test/fake_tile_manager.h
index 84f794e096c7b65ac2e1db4ddbe0f3ad67c5d88b..85106480f43a375d4e1475e8e11d72dbf66f1f51 100644
--- a/cc/test/fake_tile_manager.h
+++ b/cc/test/fake_tile_manager.h
@@ -8,6 +8,7 @@
 #include <set>
 #include <vector>
 
+#include "cc/debug/worker_thread_cost_tracker.h"
 #include "cc/resources/tile_manager.h"
 
 namespace cc {
@@ -25,6 +26,9 @@ class FakeTileManager : public TileManager {
   void Release(Tile* tile) override;
 
   std::vector<Tile*> tiles_for_raster;
+
+ private:
+  WorkerThreadCostTracker worker_thread_cost_tracker_;
 };
 
 }  // namespace cc