Add a service to handle postMessage callbacks to client

customtabs/src/android/support/customtabs/IPostMessageService.aidl

Index: customtabs/src/android/support/customtabs/IPostMessageService.aidl
diff --git a/customtabs/src/android/support/customtabs/ICustomTabsCallback.aidl b/customtabs/src/android/support/customtabs/IPostMessageService.aidl
similarity index 61%
copy from customtabs/src/android/support/customtabs/ICustomTabsCallback.aidl
copy to customtabs/src/android/support/customtabs/IPostMessageService.aidl
index c25c4f77df2e19766de42f4c7af77d1774a88964..2c8a605c9123ba51c83a125a1c632d57a6a1b8c9 100644
--- a/customtabs/src/android/support/customtabs/ICustomTabsCallback.aidl
+++ b/customtabs/src/android/support/customtabs/IPostMessageService.aidl
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2015 The Android Open Source Project
+ * Copyright (C) 2016 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,15 +16,15 @@
 
 package android.support.customtabs;
 
+import android.net.Uri;
 import android.os.Bundle;
+import android.support.customtabs.ICustomTabsCallback;
 
 /**
- * Interface to a CustomTabsCallback.
+ * Interface to a PostMessageService.
  * @hide
  */
-interface ICustomTabsCallback {
-    oneway void onNavigationEvent(int navigationEvent, in Bundle extras) = 1;
-    oneway void extraCallback(String callbackName, in Bundle args) = 2;
-    void onMessageChannelReady(in Uri origin, in Bundle extras) = 3;
-    void onPostMessage(String message, in Bundle extras) = 4;
+interface IPostMessageService {
+    void onMessageChannelReady(in ICustomTabsCallback callback, in Bundle extras) = 1;
+    void onPostMessage(in ICustomTabsCallback callback, String message, in Bundle extras) = 2;
 }