Add safetymargin for timer tests in browsers.

Add safetymargin for timer tests in browsers.

Committed: https://code.google.com/p/dart/source/detail?r=20209

[ricow1, 2013-03-19 14:45:12]

LGTM

https://codereview.chromium.org/12855003/diff/1/tests/lib/async/multiple_time...
File tests/lib/async/multiple_timer_test.dart (right):

https://codereview.chromium.org/12855003/diff/1/tests/lib/async/multiple_time...
tests/lib/async/multiple_timer_test.dart:17: 
how about:
bool get timerSafetyMargin => isCompiledByDart2Js ? 100 : 1;
and move the comments up here to not have the constants spread over the code

[floitsch, 2013-03-19 14:47:58]

https://codereview.chromium.org/12855003/diff/1/tests/lib/async/multiple_time...
File tests/lib/async/multiple_timer_test.dart (right):

https://codereview.chromium.org/12855003/diff/1/tests/lib/async/multiple_time...
tests/lib/async/multiple_timer_test.dart:17: 
On 2013/03/19 14:45:12, ricow1 wrote:
> how about:
> bool get timerSafetyMargin => isCompiledByDart2Js ? 100 : 1;
> and move the comments up here to not have the constants spread over the code

Done.

[floitsch, 2013-03-19 15:13:40]

Committed patchset #3 manually as r20209 (presubmit successful).