[PresentationAPI] Implementing send() from WebPresentationClient to the PresentationService.

content/common/presentation/presentation_service.mojom

Index: content/common/presentation/presentation_service.mojom
diff --git a/content/common/presentation/presentation_service.mojom b/content/common/presentation/presentation_service.mojom
index 36756e23a080698ec63f93627b099bba23d9750e..b5183792a2e8502dc7581d131e147ee216c203b4 100644
--- a/content/common/presentation/presentation_service.mojom
+++ b/content/common/presentation/presentation_service.mojom
@@ -74,6 +74,13 @@ interface PresentationService {
     JoinSession(string presentation_url, string? presentation_id)
         => (PresentationSessionInfo? sessionInfo, PresentationError? error);
 
+    // Called when send is called by the frame. The result callback is to get

[mark a. foltz, 2015/04/08 23:43:45]

Called when send(String) is ...

[USE s.singapati at gmail.com, 2015/04/10 16:26:05]

Done.

+    // notified that message has been received and ready for the next one.
+    SendStringMessage(
+        string presentation_url,
+        string presentation_id,
+        string message) => ();
+
     // Called when closeSession() is called by the frame.
     CloseSession(string presentation_url, string presentation_id);