Clear the clipboard closing Incognito window

content/public/test/clipboard_write_observer.cc

Index: content/public/test/clipboard_write_observer.cc
diff --git a/content/public/test/clipboard_write_observer.cc b/content/public/test/clipboard_write_observer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..1eaefa8edab1e8dd388215acdbfec0eaeff23ab2
--- /dev/null
+++ b/content/public/test/clipboard_write_observer.cc
@@ -0,0 +1,44 @@
+// Copyright (c) 2013 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 "clipboard_write_observer.h"
+
+#include "content/public/test/test_utils.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace content {
+
+ClipboardWriteObserver::ClipboardWriteObserver(ui::Clipboard* clipboard,
+                                               ui::Clipboard::Buffer buffer)
+    : seen_(false),
+      running_(false),
+      buffer_(buffer),
+      clipboard_(clipboard) {
+  clipboard_->AddObserver(this);
+  DCHECK(ui::Clipboard::IsValidBuffer(buffer_));
+}
+
+ClipboardWriteObserver::~ClipboardWriteObserver() {
+  clipboard_->RemoveObserver(this);
+}
+
+void ClipboardWriteObserver::Wait() {
+  if (seen_) return;
+
+  running_ = true;
+  message_loop_runner_ = new MessageLoopRunner;
+  message_loop_runner_->Run();
+  EXPECT_TRUE(seen_);
+}
+
+void ClipboardWriteObserver::OnWriteObjects(ui::Clipboard::Buffer buffer) {
+  if (buffer != buffer_) return;
+  seen_ = true;
+  if (!running_) return;
+
+  message_loop_runner_->Quit();
+  running_ = false;
+}
+
+}  // namespace content