Initial stub version of Async Clipboard API

third_party/WebKit/Source/core/clipboard/Clipboard.idl

Index: third_party/WebKit/Source/core/clipboard/Clipboard.idl
diff --git a/third_party/WebKit/Source/core/clipboard/Clipboard.idl b/third_party/WebKit/Source/core/clipboard/Clipboard.idl
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index 0000000000000000000000000000000000000000..22a024719a35dd7293252cec011e3c5cfdd71697
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+++ b/third_party/WebKit/Source/core/clipboard/Clipboard.idl
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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.
+
+// https://w3c.github.io/clipboard-apis/#clipboard-interface
+
+[SecureContext]
+interface Clipboard : EventTarget {
+  [CallWith=ScriptState] Promise<DataTransfer> read();
+  [CallWith=ScriptState] Promise<DOMString> readText();
+
+  [CallWith=ScriptState] Promise<void> write(DataTransfer data);
+  [CallWith=ScriptState] Promise<void> writeText(DOMString data);
+};