Plumb cc::LatencyInfo through command buffer and output surface

content/renderer/gpu/mailbox_output_surface.cc

Index: content/renderer/gpu/mailbox_output_surface.cc
diff --git a/content/renderer/gpu/mailbox_output_surface.cc b/content/renderer/gpu/mailbox_output_surface.cc
index 8d713c82fd7920c854b828a982255318ccfdce9f..89d43a13eed51a66706bf456b852cb6d2a1188b9 100644
--- a/content/renderer/gpu/mailbox_output_surface.cc
+++ b/content/renderer/gpu/mailbox_output_surface.cc
@@ -22,9 +22,11 @@ namespace content {
 MailboxOutputSurface::MailboxOutputSurface(
     int32 routing_id,
     WebGraphicsContext3D* context3D,
+    CommandBufferProxyImpl* proxy,
     cc::SoftwareOutputDevice* software_device)
     : CompositorOutputSurface(routing_id,
                               context3D,
+                              proxy,

[piman, 2013/03/19 04:30:29]

Note: I don't think this will do what you want, since in the case of the
MailboxOutputSurface, SwapBuffers isn't called on the context, nor will a
SetLatencyInfo be expected to come back.

                               software_device),
   fbo_(0) {
 }