Plumb LatencyInfo through aura.

ui/compositor/compositor.h

Index: ui/compositor/compositor.h
diff --git a/ui/compositor/compositor.h b/ui/compositor/compositor.h
index 4ec56e04e41883f55276d27ff689c407152b46a3..b923385033d59842e62ba55a0f7c8dc58c7cb350 100644
--- a/ui/compositor/compositor.h
+++ b/ui/compositor/compositor.h
@@ -54,6 +54,7 @@ class CompositorObserver;
 class ContextProviderFromContextFactory;
 class Layer;
 class PostedSwapQueue;
+struct LatencyInfo;
 
 // This class abstracts the creation of the 3D context for the compositor. It is
 // a global object.
@@ -295,6 +296,8 @@ class COMPOSITOR_EXPORT Compositor
   // from changes to layer properties.
   void ScheduleRedrawRect(const gfx::Rect& damage_rect);
 
+  void SetLatencyInfo(const ui::LatencyInfo& latency_info);
+
   // Reads the region |bounds_in_pixel| of the contents of the last rendered
   // frame into the given bitmap.
   // Returns false if the pixels could not be read.