Clear the clipboard closing Incognito window

content/public/browser/off_the_record_marker.cc

Index: content/public/browser/off_the_record_marker.cc
diff --git a/content/public/browser/off_the_record_marker.cc b/content/public/browser/off_the_record_marker.cc
new file mode 100644
index 0000000000000000000000000000000000000000..7fa50aa6359f6a8495cef2c240f7a3828cffbaeb
--- /dev/null
+++ b/content/public/browser/off_the_record_marker.cc
@@ -0,0 +1,52 @@
+// 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 "content/public/browser/off_the_record_marker.h"
+
+#include "content/public/browser/browser_context.h"
+
+namespace content {
+namespace {
+
+const char* kClipboardDestroyerKey = "ClipboardDestroyerKey";

[dcheng, 2013/02/06 22:31:40]

Nit: const char kClipboardDestroyerKey[]

[vasilii, 2013/02/07 17:30:05]

Done.

+
+// OffTheRecordClipboardDestroyer is supposed to clear the clipboard in
+// destructor if current clipboard content came from corresponding OffTheRecord
+// browser context.
+class OffTheRecordClipboardDestroyer : public base::SupportsUserData::Data {
+ public:
+  virtual ~OffTheRecordClipboardDestroyer() {
+    ui::Clipboard::SourceTag source_tag =
+        ui::Clipboard::GetForCurrentThread()->ReadSourceTag();
+    if (source_tag == ui::Clipboard::SourceTag(this)) {
+      ui::Clipboard::GetForCurrentThread()->Clear(
+          ui::Clipboard::BUFFER_STANDARD);
+    }
+  }
+};
+
+// Returns existing OffTheRecordClipboardDestroyer or creates one.
+OffTheRecordClipboardDestroyer* GetClipboardDestroyerForBrowserContext(
+    BrowserContext* context) {
+  if (base::SupportsUserData::Data* data = context->GetUserData(
+      kClipboardDestroyerKey))
+    return static_cast<OffTheRecordClipboardDestroyer*>(data);
+  OffTheRecordClipboardDestroyer* data = new OffTheRecordClipboardDestroyer;
+  context->SetUserData(kClipboardDestroyerKey, data);
+  return data;
+}
+
+} // anonymous namespace
+
+ui::Clipboard::SourceTag GetMarkerForOffTheRecordContext(
+    BrowserContext* context) {
+  if (context && context->IsOffTheRecord()) {
+    OffTheRecordClipboardDestroyer* clipboard_destroyer =
+        GetClipboardDestroyerForBrowserContext(context);
+
+    return ui::Clipboard::SourceTag(clipboard_destroyer);
+  }
+  return ui::Clipboard::SourceTag();
+}

[dcheng, 2013/02/06 22:31:40]

Nit: newline here to mirror newline at beginning of namespace block.

[vasilii, 2013/02/07 17:30:05]

Done.

+}  // namespace content