Provision to start base::SimpleTestTickClock at initial ticks

components/proximity_auth/bluetooth_throttler_impl_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 "components/proximity_auth/bluetooth_throttler_impl.h"
 
 #include <utility>
 
 #include "base/macros.h"
 #include "base/test/simple_test_tick_clock.h"
@@ skipping 16 matching lines @@
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TestBluetoothThrottler);
 };
 
 }  // namespace
 
 class ProximityAuthBluetoothThrottlerImplTest : public testing::Test {
  public:
   ProximityAuthBluetoothThrottlerImplTest()
-      : clock_(new base::SimpleTestTickClock),
-        throttler_(make_scoped_ptr(clock_)) {
-    // The throttler treats null times as special, so start with a non-null
-    // time.
-    clock_->Advance(base::TimeDelta::FromSeconds(1));
-  }
+      // The throttler treats null times as special, so start with a non-null
+      // time.
+      : clock_(new base::SimpleTestTickClock(base::TimeTicks() +
+                                             base::TimeDelta::FromSeconds(1))),
+        throttler_(make_scoped_ptr(clock_)) {}
 
   void PerformConnectionStateTransition(Connection::Status old_status,
                                         Connection::Status new_status) {
     FakeConnection connection((RemoteDevice()));
     throttler_.OnConnection(&connection);
     static_cast<ConnectionObserver*>(&throttler_)
         ->OnConnectionStatusChanged(&connection, old_status, new_status);
   }
 
  protected:
@@ skipping 38 matching lines @@
        GetDelay_DelayedConnectionAfterInProgressDisconnectIsNotThrottled) {
   // Simulate an attempt to connect (in progress connection) followed by a
   // disconnection, then allow the cooldown period to elapse.
   PerformConnectionStateTransition(Connection::IN_PROGRESS,
                                    Connection::DISCONNECTED);
   clock_->Advance(throttler_.GetCooldownTimeDelta());
   EXPECT_EQ(base::TimeDelta(), throttler_.GetDelay());
 }
 
 }  // namespace proximity_auth