[Presentation API] 1-UA: send message between controller and receiver page

content/browser/presentation/presentation_service_impl.cc

Index: content/browser/presentation/presentation_service_impl.cc
diff --git a/content/browser/presentation/presentation_service_impl.cc b/content/browser/presentation/presentation_service_impl.cc
index 27a2ad143b03dd13bbb7d1db8d72da5c53ec1a93..e628c39b091659939e945ed3afbaffac41cbe383 100644
--- a/content/browser/presentation/presentation_service_impl.cc
+++ b/content/browser/presentation/presentation_service_impl.cc
@@ -403,7 +403,10 @@ void PresentationServiceImpl::SendSessionMessage(
     blink::mojom::PresentationSessionInfoPtr session,
     blink::mojom::SessionMessagePtr session_message,
     const SendSessionMessageCallback& callback) {
-  DVLOG(2) << "SendSessionMessage";
+  DVLOG(2) << "SendSessionMessage"
+           << " [url]: " << session->url << ", [id]: " << session->id
+           << ", [process id]: " << render_process_id_
+           << ", [render frame id]: " << render_frame_id_;
   DCHECK(!session_message.is_null());
   // send_message_callback_ should be null by now, otherwise resetting of
   // send_message_callback_ with new callback will drop the old callback.
@@ -412,6 +415,13 @@ void PresentationServiceImpl::SendSessionMessage(
     return;
   }
 
+  for (auto message_observer : offscreen_presentation_observers_) {
+    ScopedVector<PresentationSessionMessage> messages;
+    messages.push_back(GetPresentationSessionMessage(session_message.Clone()));
+    message_observer->OnSessionMessages(session.To<PresentationSessionInfo>(),
+                                        messages, false);
+  }
+
   send_message_callback_.reset(new SendSessionMessageCallback(callback));
   delegate_->SendMessage(
       render_process_id_, render_frame_id_,
@@ -493,8 +503,11 @@ void PresentationServiceImpl::OnSessionMessages(
     const ScopedVector<PresentationSessionMessage>& messages,
     bool pass_ownership) {
   DCHECK(client_);
-
-  DVLOG(2) << "OnSessionMessages";
+  DVLOG(2) << "OnSessionMessages"
+           << " [url]: " << session.presentation_url
+           << ", [id]: " << session.presentation_id
+           << ", [process id]: " << render_process_id_
+           << ", [render frame id]: " << render_frame_id_;
   std::vector<blink::mojom::SessionMessagePtr> mojo_messages(messages.size());
   std::transform(messages.begin(), messages.end(), mojo_messages.begin(),
                  [pass_ownership](PresentationSessionMessage* message) {