Provision to start base::SimpleTestTickClock at initial ticks

components/metrics/profiler/tracking_synchronizer_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 "base/memory/ref_counted.h"
 #include "base/test/simple_test_tick_clock.h"
 #include "base/tracked_objects.h"
 #include "components/metrics/profiler/tracking_synchronizer.h"
 #include "components/metrics/profiler/tracking_synchronizer_observer.h"
 #include "content/public/test/test_browser_thread_bundle.h"
@@ skipping 22 matching lines @@
     EXPECT_EQ(static_cast<base::ProcessId>(239), attributes.process_id);
     EXPECT_EQ(content::ProcessType::PROCESS_TYPE_PLUGIN,
               attributes.process_type);
     ASSERT_EQ(1u, process_data_phase.tasks.size());
 
     switch (attributes.profiling_phase) {
       case 0:
         EXPECT_FALSE(got_phase_0_);
         got_phase_0_ = true;
 
-        EXPECT_EQ(base::TimeTicks() + base::TimeDelta::FromMilliseconds(111),
+        // SimpleTestTickClock starts at 1 microsecond, add to expected ticks
+        EXPECT_EQ(base::TimeTicks() + base::TimeDelta::FromMicroseconds(1) +
+                      base::TimeDelta::FromMilliseconds(111),
                   attributes.phase_start);
-        EXPECT_EQ(base::TimeTicks() + base::TimeDelta::FromMilliseconds(333),
+        EXPECT_EQ(base::TimeTicks() + base::TimeDelta::FromMicroseconds(1) +
+                      base::TimeDelta::FromMilliseconds(333),
                   attributes.phase_finish);
 
         EXPECT_EQ("death_thread0",
                   process_data_phase.tasks[0].death_thread_name);
         EXPECT_EQ(0u, past_events.size());
         break;
 
       case 1:
         EXPECT_FALSE(got_phase_1_);
         got_phase_1_ = true;
 
-        EXPECT_EQ(base::TimeTicks() + base::TimeDelta::FromMilliseconds(333),
+        // SimpleTestTickClock starts at 1 microsecond, add to expected ticks
+        EXPECT_EQ(base::TimeTicks() + base::TimeDelta::FromMicroseconds(1) +
+                      base::TimeDelta::FromMilliseconds(333),
                   attributes.phase_start);
-        EXPECT_EQ(base::TimeTicks() + base::TimeDelta::FromMilliseconds(777),
+        EXPECT_EQ(base::TimeTicks() + base::TimeDelta::FromMicroseconds(1) +
+                      base::TimeDelta::FromMilliseconds(777),
                   attributes.phase_finish);
 
         EXPECT_EQ("death_thread1",
                   process_data_phase.tasks[0].death_thread_name);
         ASSERT_EQ(1u, past_events.size());
         EXPECT_EQ(ProfilerEventProto::EVENT_FIRST_NONEMPTY_PAINT,
                   past_events[0]);
         break;
 
       default:
@@ skipping 54 matching lines @@
   profiler_data.phased_snapshots[1] = snapshot1;
   profiler_data.process_id = 239;
 
   clock->Advance(base::TimeDelta::FromMilliseconds(444));
   TestObserver test_observer;
   tracking_synchronizer->SendData(
       profiler_data, content::ProcessType::PROCESS_TYPE_PLUGIN, &test_observer);
 }
 
 }  // namespace metrics