Adds Mojo IDL.

third_party/WebKit/public/web/WebMojoBindings.h

Index: third_party/WebKit/public/web/WebMojoBindings.h
diff --git a/third_party/WebKit/public/web/WebMojoBindings.h b/third_party/WebKit/public/web/WebMojoBindings.h
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+// 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.
+
+#ifndef WebMojoBindings_h
+#define WebMojoBindings_h
+
+#include "mojo/public/cpp/system/message_pipe.h"
+#include "public/platform/WebCommon.h"
+#include <v8.h>
+
+namespace blink {
+
+class WebMojoBindings {
+ public:
+  // Creates and returns core bindings object.
+  // TODO(alokp): Replace "create" with "inject" function once gin
+  // modules are deprecated in favor of ES6 modules.
+  BLINK_EXPORT static v8::Local<v8::Value> create(v8::Local<v8::Context>);

[alokp, 2016/10/18 00:11:47]

I have retained this API for now to make is easy to transition from the bindings
implemented in mojo/edk/js. Once the transition is complete, I will implement
the solution proposed by esprehn@.

[Ken Rockot(use gerrit already), 2016/10/18 15:47:10]

I don't really understand the TODO. What do gin or ES6 modules have to do with
the core API? We can synchronously inject the Mojo interface now without
interfering with any existing code.

[alokp, 2016/10/18 16:48:37]

We can inject it now but transitioning the existing code (especially
mojo/public/js) would require quite a few changes. It would be much easier to
register the object returned by "create" as a builtin module, exactly like
mojo/edk/js/core is registered. Once we have deprecated the edk module, we can
inject the core API object and update all consumers.

It also makes it easy for me to test this implementation against existing
clients without changing too much code:
https://codereview.chromium.org/2405093003/

+
+  // Creates and returns a new V8 wrapper object for the given
+  // MessagePipeHandle instance.
+  BLINK_EXPORT static v8::Local<v8::Value> wrap(v8::Local<v8::Context>,
+                                                mojo::MessagePipeHandle);
+};
+
+}  // namespace blink
+
+#endif  // WebMojoBindings_h