WIP: Surface Synchronization System

services/ui/surfaces/display_compositor.cc

Index: services/ui/surfaces/display_compositor.cc
diff --git a/services/ui/surfaces/display_compositor.cc b/services/ui/surfaces/display_compositor.cc
index a7d48a911204453ff41b58dfe7c05e51c865a009..05610d162835c82732ff5b346ef022661a68ba0d 100644
--- a/services/ui/surfaces/display_compositor.cc
+++ b/services/ui/surfaces/display_compositor.cc
@@ -106,6 +106,13 @@ void DisplayCompositor::CreateDisplayCompositorFrameSink(
   std::unique_ptr<cc::Display> display =
       CreateDisplay(frame_sink_id, surface_handle, begin_frame_source.get());
 
+  if (!manager_.lock_manager()) {
+    std::unique_ptr<cc::DisplayCompositorLockManager> lock_manager(
+        new cc::DisplayCompositorLockManager(&manager_,
+                                             begin_frame_source.get()));
+    manager_.SetLockManager(std::move(lock_manager));
+  }
+
   compositor_frame_sinks_[frame_sink_id] =
       base::MakeUnique<GpuDisplayCompositorFrameSink>(
           this, frame_sink_id, std::move(display),