Use a cc::Display for layout tests.

cc/trees/proxy_impl.cc

Index: cc/trees/proxy_impl.cc
diff --git a/cc/trees/proxy_impl.cc b/cc/trees/proxy_impl.cc
index 603f9732cce7f64bb74e001333f8edab280d1e11..60c8c71d353a36f6342c354562e634ca8730de6d 100644
--- a/cc/trees/proxy_impl.cc
+++ b/cc/trees/proxy_impl.cc
@@ -115,6 +115,10 @@ ProxyImpl::~ProxyImpl() {
   DCHECK(IsImplThread());
   DCHECK(IsMainThreadBlocked());
 
+  // Take away the OutputSurface before destroying things so it doesn't try
+  // to call into its client mid-shutdown.
+  layer_tree_host_impl_->ReleaseOutputSurface();

[enne (OOO), 2016/06/23 23:17:55]

Please do this in single thread proxy too for consistency, if you could?

[danakj, 2016/06/23 23:21:03]

Done.

+
   scheduler_ = nullptr;
   external_begin_frame_source_ = nullptr;
   unthrottled_begin_frame_source_ = nullptr;