Replace FakeStopwatch with Clock.newStopwatch

[google]

Replace FakeStopwatch with Clock.newStopwatch

[trinarytree]

Minor problem: FakeStopwatch currently is in the testing directory but Clock isn't, and most people probably don't want test code in production. Presumably, createStopwatch would create a FakeStopwatch. Part of the problem may be that FakeStopwatch has a prejudicial name. Like Clock, nothing is really "fake" about it, it's just driven by the now function it's given.

So maybe this would be a natural migration path:

• Rename FakeStopwatch to something more neutral-sounding, like DelegatingStopwatch.
• Move it closer to Clock so that it doesn't look like test-only code.
• Add Stopwatch createStopwatch() to Clock.

[tolotrasamuel]

Is quiver not maintained anymore ? What is the outcome of this issue ?