Initial stub version of Async Clipboard API

third_party/WebKit/Source/core/clipboard/ClipboardAsync.h

Index: third_party/WebKit/Source/core/clipboard/ClipboardAsync.h
diff --git a/third_party/WebKit/Source/core/clipboard/ClipboardAsync.h b/third_party/WebKit/Source/core/clipboard/ClipboardAsync.h
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index 0000000000000000000000000000000000000000..98b8990a6cdeda07086e988079e728847ca42ff4
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+++ b/third_party/WebKit/Source/core/clipboard/ClipboardAsync.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 ClipboardAsync_h
+#define ClipboardAsync_h
+
+#include "bindings/core/v8/ScriptPromise.h"
+#include "core/CoreExport.h"
+#include "core/dom/ContextLifecycleObserver.h"
+#include "public/platform/WebClipboard.h"
+
+namespace blink {
+
+class DataTransfer;
+class ScriptPromiseResolver;
+
+class CORE_EXPORT ClipboardAsync final
+    : public GarbageCollectedFinalized<ClipboardAsync>,
+      public ContextLifecycleObserver {
+  USING_GARBAGE_COLLECTED_MIXIN(ClipboardAsync);
+
+ public:
+  virtual ~ClipboardAsync(){};
+
+  static ClipboardAsync* create(ScriptState*);
+
+  ScriptPromise scheduleRead();
+  ScriptPromise scheduleReadText();
+
+  ScriptPromise scheduleWrite(DataTransfer*);
+  ScriptPromise scheduleWriteText(const String&);
+
+  // ContextLifecycleObserver
+  void contextDestroyed(ExecutionContext*) override;
+
+  DECLARE_VIRTUAL_TRACE();
+
+ private:
+  ClipboardAsync(ScriptState*);
+
+  WebTaskRunner* getTaskRunner();
+
+  void handleRead();
+  void handleReadText();
+
+  void handleWrite(DataTransfer*);
+  void handleWriteText(const String&);
+
+  Member<ScriptPromiseResolver> m_scriptPromiseResolver;
+
+  WebClipboard::Buffer m_buffer;
+};
+
+}  // namespace blink
+
+#endif  // ClipboardAsync_h