[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..4b2810e24be8cea12031cd0b0b1ed66282432146 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(String) is called by the frame. The result callback is to get

[mark a. foltz, 2015/04/10 19:03:18]

Please wrap at 80 columns.

[USE s.singapati at gmail.com, 2015/04/14 17:51:51]

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);