mojo: Create a basic clipboard.

mojo/services/clipboard/clipboard_standalone_impl.h

Index: mojo/services/clipboard/clipboard_standalone_impl.h
diff --git a/mojo/services/clipboard/clipboard_standalone_impl.h b/mojo/services/clipboard/clipboard_standalone_impl.h
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+// Copyright (c) 2014 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 MOJO_SERVICES_CLIPBOARD_CLIPBOARD_STANDALONE_IMPL_H_
+#define MOJO_SERVICES_CLIPBOARD_CLIPBOARD_STANDALONE_IMPL_H_
+
+#include <base/memory/scoped_ptr.h>
+#include <string>
+
+#include "mojo/services/public/interfaces/clipboard/clipboard.mojom.h"
+
+namespace mojo {
+
+// Stub clipboard implementation.
+//
+// Eventually, we'll actually want to interact with the system clipboard, but
+// that's hard today because the system clipboard is asynchronous (on X11), the
+// ui::Clipboard interface is synchronous (which is what we'd use), mojo is
+// asynchronous across processes, and the WebClipboard interface is synchronous
+// (which is at least tractable).
+class ClipboardStandaloneImpl : public InterfaceImpl<mojo::Clipboard> {
+ public:
+  // mojo::Clipboard exposes three possible clipboards.
+  static const int kNumClipboards = 3;
+
+  ClipboardStandaloneImpl();
+  virtual ~ClipboardStandaloneImpl();
+
+  // InterfaceImpl<mojo::Clipboard> implementation.
+  virtual void GetSequenceNumber(Clipboard::Type clipboard_type,
+                                 const mojo::Callback<void(uint64_t)>& callback)
+      MOJO_OVERRIDE;
+  virtual void GetAvailableMimeTypes(
+      Clipboard::Type clipboard_types,
+      const mojo::Callback<void(mojo::Array<mojo::String>)>& callback)
+      MOJO_OVERRIDE;
+  virtual void ReadMimeType(
+      Clipboard::Type clipboard_type,
+      const mojo::String& mime_type,
+      const mojo::Callback<void(mojo::Array<uint8_t>)>& callback)
+      MOJO_OVERRIDE;
+  virtual void WriteClipboardData(Clipboard::Type clipboard_type,
+                                  mojo::Array<MimeTypePairPtr> data)
+      MOJO_OVERRIDE;
+
+ private:
+  uint64_t sequence_number_[kNumClipboards];
+
+  // Internal struct which stores the current state of the clipboard.
+  class ClipboardData;
+
+  // The current clipboard state. This is what is read from.
+  scoped_ptr<ClipboardData> clipboard_state_[kNumClipboards];
+
+  DISALLOW_COPY_AND_ASSIGN(ClipboardStandaloneImpl);
+};
+
+}  // namespace mojo
+
+#endif  // MOJO_SERVICES_CLIPBOARD_CLIPBOARD_STANDALONE_IMPL_H_