Make blink platform time consistent with the timer virtual time

This patch doesn't change anything unless the --enable-virtualized-time
command line flag is specifed.  If it is specified it makes
monotonicallyIncreasingTime and currentTime use the virtual
time source which drives the timers.

Also rename BlinkPlatform's currentTIme to currentTimeSeconds and
monotonicallyIncreacingTime to monotonicallyIncreacingTimeSeconds.

BUG=546953

Review URL: https://codereview.chromium.org/1411843008

Cr-Commit-Position: refs/heads/master@{#358291}
36 files changed