Provision to start base::SimpleTestTickClock at initial ticks

components/copresence/timed_map_unittest.cc

 // Copyright (c) 2011 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 "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/test/simple_test_tick_clock.h"
 #include "components/copresence/timed_map.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 79 matching lines @@
 
   EXPECT_FALSE(two_element_map.HasKey(0x1337));
   EXPECT_EQ(0, two_element_map.GetValue(0x1337).value);
 }
 
 TEST_F(TimedMapTest, TimedEvict) {
   const int kLargeTimeValueSeconds = 9999;
   Map map(base::TimeDelta::FromSeconds(kLargeTimeValueSeconds), 2);
 
   // The map takes ownership of the clock, but we retain a pointer.
-  base::SimpleTestTickClock* clock = new base::SimpleTestTickClock;
+  base::SimpleTestTickClock* clock =
+      new base::SimpleTestTickClock(base::TimeTicks());
   map.set_clock_for_testing(make_scoped_ptr<base::TickClock>(clock));
 
   // Add value at T=0.
   map.Add(0x1337, Value(0x7331));
   EXPECT_TRUE(map.HasKey(0x1337));
   EXPECT_EQ(0x7331, map.GetValue(0x1337).value);
 
   // Add value at T=kLargeTimeValueSeconds-1.
   clock->Advance(base::TimeDelta::FromSeconds(kLargeTimeValueSeconds - 1));
   map.Add(0xbaad, Value(0xf00d));
 
   // Check values at T=kLargeTimeValueSeconds-1.
   EXPECT_TRUE(map.HasKey(0xbaad));
   EXPECT_EQ(0xf00d, map.GetValue(0xbaad).value);
   EXPECT_TRUE(map.HasKey(0x1337));
   EXPECT_EQ(0x7331, map.GetValue(0x1337).value);
 
   // Check values at T=kLargeTimeValueSeconds.
   clock->Advance(base::TimeDelta::FromSeconds(1));
   EXPECT_FALSE(map.HasKey(0x1337));
   EXPECT_EQ(0, map.GetValue(0x1337).value);
   EXPECT_TRUE(map.HasKey(0xbaad));
   EXPECT_EQ(0xf00d, map.GetValue(0xbaad).value);
 
   // Check values at T=2*kLargeTimeValueSeconds
   clock->Advance(base::TimeDelta::FromSeconds(kLargeTimeValueSeconds));
   EXPECT_FALSE(map.HasKey(0xbaad));
   EXPECT_EQ(0, map.GetValue(0xbaad).value);
 }