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/extensions/api_test/content_scripts/other_extensions/injector/background.js b/base/tick_clock.cc
similarity index 64%
copy from chrome/test/data/extensions/api_test/content_scripts/other_extensions/injector/background.js
copy to base/tick_clock.cc
index d0f305ef89a07f21e9ac69a38e54f16877364fc4..520c568fb80800a81fc10d4c4f8e963a42f3573e 100644
--- a/chrome/test/data/extensions/api_test/content_scripts/other_extensions/injector/background.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.
 
-console.log('INJECTOR: Loaded injector!');
+#include "base/tick_clock.h"
 
-chrome.tabs.create({ url: "test.html" });
+namespace base {
+
+TickClock::~TickClock() {}
+
+}  // namespace base