Initial stub version of Async Clipboard API

third_party/WebKit/Source/core/frame/NavigatorClipboard.idl

Index: third_party/WebKit/Source/core/frame/NavigatorClipboard.idl
diff --git a/third_party/WebKit/Source/core/frame/NavigatorClipboard.idl b/third_party/WebKit/Source/core/frame/NavigatorClipboard.idl
new file mode 100644
index 0000000000000000000000000000000000000000..a1ee432b97887c66a1b4cf80bcfe7dc21c06b8c8
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+++ b/third_party/WebKit/Source/core/frame/NavigatorClipboard.idl
@@ -0,0 +1,11 @@
+// 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/#navigator-interface
+
+[RuntimeEnabled=AsyncClipboard]
+partial interface Navigator {
+  [CallWith=ScriptState, SecureContext, SameObject]
+  readonly attribute Clipboard clipboard;
+};