Provision to start base::SimpleTestTickClock at initial ticks

chrome/browser/captive_portal/captive_portal_service_unittest.cc

 // Copyright (c) 2012 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 "chrome/browser/captive_portal/captive_portal_service.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/macros.h"
 #include "base/prefs/pref_service.h"
@@ skipping 84 matching lines @@
         old_captive_portal_testing_state_);
   }
 
   // |enable_service| is whether or not the captive portal service itself
   // should be disabled.  This is different from enabling the captive portal
   // detection preference.
   void Initialize(CaptivePortalService::TestingState testing_state) {
     CaptivePortalService::set_state_for_testing(testing_state);
 
     profile_.reset(new TestingProfile());
-    tick_clock_.reset(new base::SimpleTestTickClock());
-    tick_clock_->Advance(base::TimeTicks::Now() - tick_clock_->NowTicks());
+    tick_clock_.reset(new base::SimpleTestTickClock(base::TimeTicks::Now()));
     service_.reset(new CaptivePortalService(profile_.get(), tick_clock_.get()));
 
     // Use no delays for most tests.
     set_initial_backoff_no_portal(base::TimeDelta());
     set_initial_backoff_portal(base::TimeDelta());
 
     set_detector(&service_->captive_portal_detector_);
     SetTime(base::Time::Now());
 
     // Disable jitter, so can check exact values.
@@ skipping 401 matching lines @@
       base::Time::FromString("Tue, 17 Apr 2012 18:02:00 GMT", &start_time));
   SetTime(start_time);
 
   RunTest(captive_portal::RESULT_NO_RESPONSE,
           net::OK,
           503,
           0,
           "HTTP/1.1 503 OK\nRetry-After: Tue, 17 Apr 2012 18:02:51 GMT\n\n");
   EXPECT_EQ(base::TimeDelta::FromSeconds(51), GetTimeUntilNextRequest());
 }