Use pdf compositor service for printing when OOPIF is enabled

headless/lib/browser/headless_web_contents_impl.cc

Index: headless/lib/browser/headless_web_contents_impl.cc
diff --git a/headless/lib/browser/headless_web_contents_impl.cc b/headless/lib/browser/headless_web_contents_impl.cc
index 86f4716fcb81f0558cb6490375fc10788b19da0b..b1e041a38c0f7293e1e5018b27510863329c069e 100644
--- a/headless/lib/browser/headless_web_contents_impl.cc
+++ b/headless/lib/browser/headless_web_contents_impl.cc
@@ -283,6 +283,7 @@ HeadlessWebContentsImpl::HeadlessWebContentsImpl(
       weak_ptr_factory_(this) {
 #if BUILDFLAG(ENABLE_BASIC_PRINTING) && !defined(CHROME_MULTIPLE_DLL_CHILD)
   HeadlessPrintManager::CreateForWebContents(web_contents);
+// TODO(weili): Add support for printing OOPIFs.
 #endif
   web_contents->GetMutableRendererPrefs()->accept_languages =
       browser_context->options()->accept_language();