Provision to start base::SimpleTestTickClock at initial ticks

base/test/simple_test_tick_clock.h

Index: base/test/simple_test_tick_clock.h
diff --git a/base/test/simple_test_tick_clock.h b/base/test/simple_test_tick_clock.h
index aebdebcbcf54e7016a1629b5405eb40cbf22d801..629ced9f7841408e6eaffbeffd9f50ae4d15f3b8 100644
--- a/base/test/simple_test_tick_clock.h
+++ b/base/test/simple_test_tick_clock.h
@@ -17,8 +17,9 @@ namespace base {
 // called from any thread.
 class SimpleTestTickClock : public TickClock {
  public:
-  // Starts off with a clock set to TimeTicks().
-  SimpleTestTickClock();
+  // Start off with a clock set to some initial tick(s)
+  // Avoids having to Advance(initial) for tests
+  SimpleTestTickClock(TimeTicks initial = TimeTicks());

[Paweł Hajdan Jr., 2015/06/30 11:40:19]

Default arguments are prohibited, please see
https://google-styleguide.googlecode.com/svn/trunk/cppguide.html#Default_Argu...
.

[Ankur Verma, 2015/06/30 11:58:39]

Quoting from the above documentation:
"In addition, default function parameters are allowed in constructors. Most of
the cons listed above don't apply to constructors because it's impossible to
take their address."

[Paweł Hajdan Jr., 2015/07/15 17:36:59]

Ah, you're right, I didn't notice this. Sorry.

   ~SimpleTestTickClock() override;
 
   TimeTicks NowTicks() override;