Make printing work better with OOPIF.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index f822db34923116594a7726b52f5318c3962bec3b..fd4f91e9f4d1d39a13525d82911a6aca80263191 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -1494,6 +1494,11 @@ MediaStreamDispatcher* RenderFrameImpl::GetMediaStreamDispatcher() {
              : nullptr;
 }
 
+void RenderFrameImpl::ScriptedPrint(bool user_initiated) {
+  for (auto& observer : observers_)
+    observer.ScriptedPrint(user_initiated);
+}
+
 bool RenderFrameImpl::Send(IPC::Message* message) {
   return RenderThread::Get()->Send(message);
 }