Force use of and cache render surface.

cc/surfaces/display.cc

Index: cc/surfaces/display.cc
diff --git a/cc/surfaces/display.cc b/cc/surfaces/display.cc
index 846897b21806db19b8c100a9660caa75ee05f441..c242bc7b79ecdd73c2ad906b1ae2c69902fc0517 100644
--- a/cc/surfaces/display.cc
+++ b/cc/surfaces/display.cc
@@ -277,9 +277,8 @@ bool Display::DrawAndSwap() {
                                      stored_latency_info_.end());
   stored_latency_info_.clear();
   bool have_copy_requests = false;
-  for (const auto& pass : frame.render_pass_list) {
+  for (const auto& pass : frame.render_pass_list)
     have_copy_requests |= !pass->copy_requests.empty();
-  }
 
   gfx::Size surface_size;
   bool have_damage = false;