linux_aura: Implement dropping in chrome.

ui/base/dragdrop/desktop_selection_provider_aurax11.h

+// Copyright (c) 2012 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 UI_BASE_DRAGDROP_DESKTOP_SELECTION_PROVIDER_AURAX11_H_
+#define UI_BASE_DRAGDROP_DESKTOP_SELECTION_PROVIDER_AURAX11_H_
+
+#include "ui/base/ui_export.h"
+
+namespace ui {
+class OSExchangeDataProviderAuraX11;
+
+// Used by OSExchangeDataProviderAuraX11 to attach itself to an object which
+// can provide it with SelectionNotify events.
+class UI_EXPORT DesktopSelectionProviderAuraX11 {
+ public:
+  virtual ~DesktopSelectionProviderAuraX11() {}
+
+  virtual void SetDropHandler(OSExchangeDataProviderAuraX11* handler) = 0;
+};
+
+}  // namespace
+
+#endif  // UI_BASE_DRAGDROP_DESKTOP_SELECTION_PROVIDER_AURAX11_H_