Force use of and cache render surface.

cc/output/direct_renderer.cc

Index: cc/output/direct_renderer.cc
diff --git a/cc/output/direct_renderer.cc b/cc/output/direct_renderer.cc
index b97dec844b74a91eda2f5a96c5dce6fe0e246cb0..c1683683e53e6e17fc84112d25f09826d0491564 100644
--- a/cc/output/direct_renderer.cc
+++ b/cc/output/direct_renderer.cc
@@ -627,6 +627,14 @@ bool DirectRenderer::UseRenderPass(const RenderPass* render_pass) {
   }
   DCHECK(texture->id());
 
+  if (render_pass->cache_render_surface &&
+      !render_pass->has_damage_from_contributing_content) {
+    return false;
+  }
+
+  if (current_frame()->ComputeScissorRectForRenderPass().IsEmpty())
+    return false;
+
   if (BindFramebufferToTexture(texture)) {
     InitializeViewport(current_frame(), render_pass->output_rect,
                        gfx::Rect(render_pass->output_rect.size()),