Force use of and cache render surface.

cc/output/gl_renderer.cc

Index: cc/output/gl_renderer.cc
diff --git a/cc/output/gl_renderer.cc b/cc/output/gl_renderer.cc
index b52405c82ee34b1517c8b71305f89b1ca886ed50..450422af61b7032f77fc3ee91aa9e85890fb919d 100644
--- a/cc/output/gl_renderer.cc
+++ b/cc/output/gl_renderer.cc
@@ -989,7 +989,7 @@ const TileDrawQuad* GLRenderer::CanPassBeDrawnDirectly(const RenderPass* pass) {
   if (pass->quad_list.size() != 1)
     return nullptr;
   // If we need copy requests, then render pass has to exist.
-  if (!pass->copy_requests.empty())
+  if (!pass->copy_requests.empty() || pass->force_render_surface)

[reveman, 2017/05/10 13:06:17]

I'm not sure we want to avoid this optimization. It's still useful to skip the
intermediate texture when not needed. I think it would be better to leave this
as is. Wdyt?

[wutao, 2017/05/11 19:36:34]

Agree. Removed.

     return nullptr;
 
   const DrawQuad* quad = *pass->quad_list.BackToFrontBegin();