Adds Mojo IDL.

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

Index: third_party/WebKit/Source/core/mojo/MojoScopedHandle.cpp
diff --git a/third_party/WebKit/Source/core/mojo/MojoScopedHandle.cpp b/third_party/WebKit/Source/core/mojo/MojoScopedHandle.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..0600a1ff4b4f7685c507752b77e247c09233aa51
--- /dev/null
+++ b/third_party/WebKit/Source/core/mojo/MojoScopedHandle.cpp
@@ -0,0 +1,28 @@
+// 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/MojoScopedHandle.h"
+
+namespace blink {
+
+MojoScopedHandle::MojoScopedHandle(::MojoHandle handle) : m_handle(handle) {}
+
+MojoScopedHandle::~MojoScopedHandle() {
+  if (m_handle != MOJO_HANDLE_INVALID)
+    MojoClose(m_handle);
+}
+
+::MojoHandle MojoScopedHandle::release() {
+  ::MojoHandle handle = m_handle;
+  m_handle = MOJO_HANDLE_INVALID;
+  return handle;
+}
+
+MojoResult MojoScopedHandle::close() {
+  MojoResult result = MojoClose(m_handle);
+  m_handle = MOJO_HANDLE_INVALID;
+  return result;
+}
+
+}  // namespace blink