Adds Mojo IDL.

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

Index: third_party/WebKit/Source/core/mojo/MojoCreateMessagePipeOptions.idl
diff --git a/third_party/WebKit/Source/core/mojo/MojoCreateMessagePipeOptions.idl b/third_party/WebKit/Source/core/mojo/MojoCreateMessagePipeOptions.idl
new file mode 100644
index 0000000000000000000000000000000000000000..addd2baa0c3f224db08381a54f144d533770a9ba
--- /dev/null
+++ b/third_party/WebKit/Source/core/mojo/MojoCreateMessagePipeOptions.idl
@@ -0,0 +1,7 @@
+// Copyright 2016 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 MojoCreateMessagePipeOptions {
+    MojoCreateMessagePipeOptionsFlags flags;

[jbroman, 2017/01/10 20:46:30]

The webby way would be for the particular flags to be booleans in the
dictionary. As there currently are none, this can go away (and in fact
MojoCreateMessagePipeOptions can go away entirely, as it could be added as
"optional MojoCreateMessagePipeOptions" in the future if any options come into
existence, without breaking compatibility).

That is, callers today could look like:

var { result, handle0, handle1 } = mojo.createMessagePipe();

and in the future, that might become: mojo.createMessagePipe({ extraWidePipes:
true }) or whatever

[alokp, 2017/01/11 21:53:01]

Done.

+};