Adds Mojo IDL.

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

Index: third_party/WebKit/Source/core/mojo/Mojo.idl
diff --git a/third_party/WebKit/Source/core/mojo/Mojo.idl b/third_party/WebKit/Source/core/mojo/Mojo.idl
new file mode 100644
index 0000000000000000000000000000000000000000..416d3a0b8fcd88a1ba789415b1c0f46b17895557
--- /dev/null
+++ b/third_party/WebKit/Source/core/mojo/Mojo.idl
@@ -0,0 +1,30 @@
+// 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();

[alokp, 2017/01/20 23:11:56]

Elliot: When I declare this function as static, the generate V8Mojo has "#error
not implemented yet". I think from here:

https://cs.chromium.org/chromium/src/third_party/WebKit/Source/bindings/scrip...

Am I doing something wrong?

Replacing #error with v8SetReturnValue(info, {cpp_value}), fixes the issue.

[jbroman, 2017/01/24 21:21:03]

It just hasn't been implemented yet. I think it's a little more than that
(because it's a static method, we don't validate the holder, and need to use the
current context when responding), but not too hard. I'll send a CL.

[jbroman, 2017/01/24 21:25:51]

https://codereview.chromium.org/2653093002

+};