Add a Clock and TickClock interface for mocking out time

base/tick_clock.cc

Index: base/tick_clock.cc
diff --git a/chrome/test/data/panels/context_menu/panel.js b/base/tick_clock.cc
similarity index 64%
copy from chrome/test/data/panels/context_menu/panel.js
copy to base/tick_clock.cc
index 58cb34ee3d4a63ea5f6571ee283826d5a45fd9d4..520c568fb80800a81fc10d4c4f8e963a42f3573e 100644
--- a/chrome/test/data/panels/context_menu/panel.js
+++ b/base/tick_clock.cc
@@ -2,6 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-var background_page = chrome.extension.getBackgroundPage();
-background_page.panelCallback();
+#include "base/tick_clock.h"
 
+namespace base {
+
+TickClock::~TickClock() {}
+
+}  // namespace base