Pass onPostDialChar call back from Telephony to Telecom.

Add plumbing to alert Telecom every time a character is processed after
the post dial wait state (the processing happens in Telephony).

Bug: 18644688
Change-Id: I487d76aa9c959ca528c6377374aa35c2d0b4a803

telecomm/java/android/telecom/RemoteConnectionService.java

@@ -222,6 +222,12 @@ final class RemoteConnectionService {
                     .setPostDialWait(remaining);
         }
 
+        @Override
+        public void onPostDialChar(String callId, char nextChar) {
+            findConnectionForAction(callId, "onPostDialChar")
+                    .onPostDialChar(nextChar);
+        }
+
         @Override
         public void queryRemoteConnectionServices(RemoteServiceCallback callback) {
             // Not supported from remote connection service.