Fix destruction order between SurfaceManger and OffscreenCanvasSurfaceImpl

cc/surfaces/surface_factory.h

Index: cc/surfaces/surface_factory.h
diff --git a/cc/surfaces/surface_factory.h b/cc/surfaces/surface_factory.h
index c869029cbaabe66cefb25c4934a5368bc9c7980c..d73817abb586ba1849091ff9c302597009f536f8 100644
--- a/cc/surfaces/surface_factory.h
+++ b/cc/surfaces/surface_factory.h
@@ -83,6 +83,8 @@ class CC_SURFACES_EXPORT SurfaceFactory
   bool needs_sync_points() const { return needs_sync_points_; }
   void set_needs_sync_points(bool needs) { needs_sync_points_ = needs; }
 
+  void onSurfaceManagerDestroyed() { manager_ = nullptr; }
+
  private:
   SurfaceManager* manager_;
   SurfaceFactoryClient* client_;