Adds Mojo IDL.

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

Index: third_party/WebKit/Source/core/mojo/MojoCreateMessagePipeResult.idl
diff --git a/third_party/WebKit/Source/core/mojo/MojoCreateMessagePipeResult.idl b/third_party/WebKit/Source/core/mojo/MojoCreateMessagePipeResult.idl
new file mode 100644
index 0000000000000000000000000000000000000000..eb2d1b0ae4f45927fa91212d0f88bf31bfebab00
--- /dev/null
+++ b/third_party/WebKit/Source/core/mojo/MojoCreateMessagePipeResult.idl
@@ -0,0 +1,10 @@
+// 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.
+
+dictionary MojoCreateMessagePipeResult {
+    // TODO(alokp): Consider raising exception for error.
+    required MojoResult result;
+    MojoHandle handle0;
+    MojoHandle handle1;
+};