Adds Mojo IDL.

third_party/WebKit/Source/core/mojo/Mojo.idl

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+typedef unsigned long MojoResult;
+
+[
+    RuntimeEnabled=MojoJS,
+] interface Mojo {
+    const MojoResult RESULT_OK = 0;
+    const MojoResult RESULT_CANCELLED = 1;
+    const MojoResult RESULT_UNKNOWN = 2;
+    const MojoResult RESULT_INVALID_ARGUMENT = 3;
+    const MojoResult RESULT_DEADLINE_EXCEEDED = 4;
+    const MojoResult RESULT_NOT_FOUND = 5;
+    const MojoResult RESULT_ALREADY_EXISTS = 6;
+    const MojoResult RESULT_PERMISSION_DENIED = 7;
+    const MojoResult RESULT_RESOURCE_EXHAUSTED = 8;
+    const MojoResult RESULT_FAILED_PRECONDITION = 9;
+    const MojoResult RESULT_ABORTED = 10;
+    const MojoResult RESULT_OUT_OF_RANGE = 11;
+    const MojoResult RESULT_UNIMPLEMENTED = 12;
+    const MojoResult RESULT_INTERNAL = 13;
+    const MojoResult RESULT_UNAVAILABLE = 14;
+    const MojoResult RESULT_DATA_LOSS = 15;
+    const MojoResult RESULT_BUSY = 16;
+    const MojoResult RESULT_SHOULD_WAIT = 17;
+
+    static MojoCreateMessagePipeResult createMessagePipe();
+};