Replaced TestNowSource with SimpleTestTickClock.

base/test/simple_test_tick_clock.cc

Index: base/test/simple_test_tick_clock.cc
diff --git a/base/test/simple_test_tick_clock.cc b/base/test/simple_test_tick_clock.cc
index 1b4696fb592361e25562f2692089090beb50cf4e..e8ac00135d795812f7f768009d0037d5b96f64e3 100644
--- a/base/test/simple_test_tick_clock.cc
+++ b/base/test/simple_test_tick_clock.cc
@@ -10,6 +10,14 @@ namespace base {
 
 SimpleTestTickClock::SimpleTestTickClock() {}
 
+SimpleTestTickClock::SimpleTestTickClock(int64_t initial) : now_ticks_() {
+  now_ticks_ = TimeTicks::FromInternalValue(initial);
+}
+
+SimpleTestTickClock::SimpleTestTickClock(TimeTicks initial) : now_ticks_() {
+  now_ticks_ = initial;
+}
+
 SimpleTestTickClock::~SimpleTestTickClock() {}
 
 TimeTicks SimpleTestTickClock::NowTicks() {
@@ -17,10 +25,25 @@ TimeTicks SimpleTestTickClock::NowTicks() {
   return now_ticks_;
 }
 
+void SimpleTestTickClock::Set(TimeTicks time) {
+  AutoLock lock(lock_);
+  DCHECK(time >= now_ticks_);  // Time should always go forward.
+  now_ticks_ = time;
+}
+
 void SimpleTestTickClock::Advance(TimeDelta delta) {
   AutoLock lock(lock_);
   DCHECK(delta >= TimeDelta());
   now_ticks_ += delta;
 }
 
+// SimpleTestTickClock::Convenience functions
+void SimpleTestTickClock::AdvanceMicroseconds(int64_t period_in_microseconds) {
+  Advance(TimeDelta::FromMicroseconds(period_in_microseconds));
+}
+
+void SimpleTestTickClock::SetMicroseconds(int64_t time_in_microseconds) {
+  Set(TimeTicks::FromInternalValue(time_in_microseconds));
+}
+
 }  // namespace base