Adds Mojo IDL.

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

Index: third_party/WebKit/Source/core/mojo/MojoMessagePipeHandle.h
diff --git a/third_party/WebKit/Source/core/mojo/MojoMessagePipeHandle.h b/third_party/WebKit/Source/core/mojo/MojoMessagePipeHandle.h
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index 0000000000000000000000000000000000000000..c5ee03d80ac5e994baf29e3eb79bb11a3efcae7f
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+++ b/third_party/WebKit/Source/core/mojo/MojoMessagePipeHandle.h
@@ -0,0 +1,31 @@
+// 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 MojoMessagePipeHandle_h
+#define MojoMessagePipeHandle_h
+
+#include "bindings/core/v8/ScriptWrappable.h"
+#include "core/mojo/MojoScopedHandle.h"
+
+namespace blink {
+
+class MojoMessagePipeHandle final
+    : public GarbageCollectedFinalized<MojoMessagePipeHandle>,
+      public MojoScopedHandle,
+      public ScriptWrappable {
+  DEFINE_WRAPPERTYPEINFO();
+
+ public:
+  CORE_EXPORT static MojoMessagePipeHandle* create(::MojoHandle);
+  virtual ~MojoMessagePipeHandle();
+
+  DEFINE_INLINE_TRACE() {}
+
+ private:
+  explicit MojoMessagePipeHandle(::MojoHandle);
+};
+
+}  // namespace blink
+
+#endif  // MojoMessagePipeHandle_h