Implement ui::ClipboardMus.

ui/views/mus/clipboard_unittest.cc

Index: ui/views/mus/clipboard_unittest.cc
diff --git a/ui/base/clipboard/clipboard_unittest.cc b/ui/views/mus/clipboard_unittest.cc
similarity index 67%
copy from ui/base/clipboard/clipboard_unittest.cc
copy to ui/views/mus/clipboard_unittest.cc
index 96bf40b4ec4dd6882f910a6ff38acb92fb5a1741..a80caa65cea801565790dd966ddf50cff1006dd5 100644
--- a/ui/base/clipboard/clipboard_unittest.cc
+++ b/ui/views/mus/clipboard_unittest.cc
@@ -1,14 +1,19 @@
-// Copyright 2014 The Chromium Authors. All rights reserved.
+// Copyright 2016 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.
 
-#include "ui/base/clipboard/clipboard.h"
+#include "ui/views/mus/clipboard_mus.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
+#include "ui/events/platform/platform_event_source.h"
 
 namespace ui {
 
 struct PlatformClipboardTraits {
+  static std::unique_ptr<PlatformEventSource> GetEventSource() {
+    return std::unique_ptr<PlatformEventSource>();
+  }
+
   static Clipboard* Create() { return Clipboard::GetForCurrentThread(); }
 
   static void Destroy(Clipboard* clipboard) {