Rename timeMs into time

Use number instead of string to store time.
We don't use unit suffixes in other privet parts. Also suffix should not
be necessary as milliseconds is default Javascript time format.

BUG=26160070

Change-Id: I779f3fd3e232d47724cfdb67072a980c4d966a8b
Reviewed-on: https://weave-review.googlesource.com/1925
Reviewed-by: Alex Vakulenko <avakulenko@google.com>
2 files changed