GitLab

https://chromeperf.appspot.com/report?masters=ChromiumPerf&bots=chromium-rel-win8-dual&tests=startup.warm.dirty.blank_page%2Fwindow_display_time&rev=286928

It is not a real regression, the initial_time and initial_ticks are not properly initialized when switching to HighResolution (i.e. QPC).
This CL initializes the now_function to the HighResNowWrapper instead of setting it to RolloverProtectedNow then to the HighResNowWrapper.

By doing that, we avoid getting an incorrect initial_time and initial_ticks using the RolloverProtectedNow and avoid having to reinitialize.

BUG=158234

Review URL: https://codereview.chromium.org/446203002

Cr-Commit-Position: refs/heads/master@{#291974}