Adds Mojo IDL.

third_party/WebKit/Source/core/mojo/MojoHandle.h

Index: third_party/WebKit/Source/core/mojo/MojoHandle.h
diff --git a/third_party/WebKit/Source/core/mojo/MojoHandle.h b/third_party/WebKit/Source/core/mojo/MojoHandle.h
new file mode 100644
index 0000000000000000000000000000000000000000..78fa9138b91b48b5c6a4a888a89e79b86c7a4235
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+++ b/third_party/WebKit/Source/core/mojo/MojoHandle.h
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+// 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.
+
+#ifndef MojoHandle_h
+#define MojoHandle_h
+
+#include "bindings/core/v8/ScriptWrappable.h"
+#include "mojo/public/cpp/system/core.h"
+
+namespace blink {
+
+class ArrayBufferOrArrayBufferView;
+class MojoHandleSignals;
+class MojoReadMessageFlags;
+class MojoReadMessageResult;
+class MojoWatchCallback;
+class MojoWatcher;
+class ScriptState;
+
+class MojoHandle final : public GarbageCollectedFinalized<MojoHandle>,
+                         public ScriptWrappable {
+  DEFINE_WRAPPERTYPEINFO();
+
+ public:
+  CORE_EXPORT static MojoHandle* create(mojo::ScopedHandle);
+
+  void close();
+  MojoWatcher* watch(ScriptState*,
+                     const MojoHandleSignals&,
+                     MojoWatchCallback*);
+  MojoResult writeMessage(ArrayBufferOrArrayBufferView&,
+                          const HeapVector<Member<MojoHandle>>&);
+  void readMessage(const MojoReadMessageFlags&, MojoReadMessageResult&);
+
+  DEFINE_INLINE_TRACE() {}
+
+ private:
+  explicit MojoHandle(mojo::ScopedHandle);
+
+  mojo::ScopedHandle m_handle;
+};
+
+}  // namespace blink
+
+#endif  // MojoHandle_h