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Previously, text output for time intervals always was rounded
down. For example, a time interval of 1 min 59 sec was
displayed as "1 min", which was confusing users in some cases.
This CL implements rounding to nearest integer. Some example
outputs are given below.

0.49 sec --> "0 secs"
0.5  sec --> "1 sec"
59.4 sec --> "59 secs"
59.5 sec --> "1 min"
89.9 sec --> "1 min"
90.0 sec --> "2 mins"
59 min   --> "59 mins"
60 min   --> "1 hour"
89 min   --> "1 hour"
90 min   --> "2 hours"
...

BUG=338631
TEST=unit tests updated

Review URL: https://codereview.chromium.org/143633003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247948 0039d316-1c4b-4281-b951-d872f2087c98