[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 99ab552c37f40c542d3588b9c14c0189abb8df32..8438ac7c49806fb3ca9f0ddbb80186a2bec663ee 100644
--- a/content/common/presentation/presentation_service.mojom
+++ b/content/common/presentation/presentation_service.mojom
@@ -21,6 +21,17 @@ struct PresentationError {
     string message;
 };
 
+enum MessageType {

[imcheng, 2015/04/02 23:57:24]

Doesn't look like these are used. Remove them for now?

[USE s.singapati at gmail.com, 2015/04/07 17:45:16]

Done.

+    TEXT,
+    BINARY,
+};
+
+enum BinaryType {
+    NONE,
+    BLOB,
+    ARRAYBUFFER,
+};
+
 interface PresentationService {
     // Called when the frame sets or changes the default presentation URL or
     // presentation ID.
@@ -70,6 +81,12 @@ interface PresentationService {
     JoinSession(string presentation_url, string? presentation_id)
         => (PresentationSessionInfo? sessionInfo, PresentationError? error);
 
+    // Called when postMessage is called by the frame.
+    PostMessages(
+        string presentation_url,
+        string presentation_id,
+        array<string> string_messages);

[imcheng, 2015/04/02 23:57:24]

=> ();

This means PresentationDispatcher will supply a no-arg callback to be invoked by
PresentationServiceImpl to acknowledge that it has received the message and
ready for the next one.

[USE s.singapati at gmail.com, 2015/04/07 17:45:16]

Done.

+
     // Called when closeSession() is called by the frame.
     CloseSession(string presentation_url, string presentation_id);
 };