Adds Mojo IDL.

third_party/WebKit/Source/core/mojo/MojoInterfaceProvider.cpp

+// 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.
+
+#include "core/mojo/MojoInterfaceProvider.h"
+
+#include "core/mojo/MojoHandle.h"
+
+namespace blink {
+
+MojoInterfaceProvider::MojoInterfaceProvider(
+    std::unique_ptr<InterfaceProvider> provider)
+    : m_provider(std::move(provider)) {
+  DCHECK(m_provider);
+}
+
+MojoInterfaceProvider::~MojoInterfaceProvider() {}
+
+MojoHandle* MojoInterfaceProvider::getInterface(String name) {
+  mojo::MessagePipe pipe;
+  m_provider->getInterface(name.utf8().data(), std::move(pipe.handle0));
+  return new MojoHandle(mojo::ScopedHandle::From(std::move(pipe.handle1)));
+}
+
+}  // namespace blink