Pass FROM_HERE to ObserverListThreadSafe::Notify to improve profile.

ui/compositor/compositor_vsync_manager.cc

Index: ui/compositor/compositor_vsync_manager.cc
diff --git a/ui/compositor/compositor_vsync_manager.cc b/ui/compositor/compositor_vsync_manager.cc
index 1a10d4ad30965904482b28bedf1d6427d730a12c..17336e6198672006b76b217dd7e04b84d4fffa5f 100644
--- a/ui/compositor/compositor_vsync_manager.cc
+++ b/ui/compositor/compositor_vsync_manager.cc
@@ -55,9 +55,8 @@ void CompositorVSyncManager::RemoveObserver(Observer* observer) {
 void CompositorVSyncManager::NotifyObservers(base::TimeTicks timebase,
                                              base::TimeDelta interval) {
   observer_list_->Notify(
-      &CompositorVSyncManager::Observer::OnUpdateVSyncParameters,
-      timebase,
-      interval);
+      FROM_HERE, &CompositorVSyncManager::Observer::OnUpdateVSyncParameters,
+      timebase, interval);
 }
 
 }  // namespace ui