Provision to start base::SimpleTestTickClock at initial ticks

chrome/browser/sessions/session_restore_stats_collector_unittest.cc

 // Copyright 2015 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/sessions/session_restore_stats_collector.h"
 
 #include <stddef.h>
 #include <utility>
 
 #include "base/macros.h"
@@ skipping 178 matching lines @@
 
     // Ownership of the reporting delegate is passed to the
     // SessionRestoreStatsCollector, but a raw pointer is kept to it so it can
     // be queried by the test.
     passthrough_reporting_delegate_ = new PassthroughStatsReportingDelegate();
 
     // Ownership of this clock is passed to the SessionRestoreStatsCollector.
     // A raw pointer is kept to it so that it can be modified from the outside.
     // The unittest must take care to access the clock only while the
     // SessionRestoreStatsCollector under test is still alive.
-    test_tick_clock_ = new base::SimpleTestTickClock();
+    test_tick_clock_ = new base::SimpleTestTickClock(base::TimeTicks());
 
     // Create a stats collector, keep a raw pointer to it, and detach from it.
     // The stats collector will stay alive as long as it has not yet completed
     // its job, and will clean itself up when done.
     scoped_refptr<TestSessionRestoreStatsCollector> stats_collector =
         new TestSessionRestoreStatsCollector(
             scoped_ptr<base::TickClock>(test_tick_clock_),
             scoped_ptr<StatsReportingDelegate>(
                 passthrough_reporting_delegate_));
     stats_collector_ = stats_collector.get();
@@ skipping 421 matching lines @@
   mock_reporting_delegate.ExpectReportTabLoaderStatsCalled(2, 1, 1, 0, 0, 0, 0,
                                                            1);
   mock_reporting_delegate.EnsureNoUnexpectedCalls();
 
   // Destroy the background tab. The collector should release itself.
   Tick();  // 3 ms.
   GenerateWebContentsDestroyed(1);
   mock_reporting_delegate.ExpectReportStatsCollectorDeathCalled();
   mock_reporting_delegate.EnsureNoUnexpectedCalls();
 }