power_LoadTest: Add 1 hour web browsing (only) test

This separates out the web browsing part of power_LoadTest and runs it for
an hour. The background window is still loaded.

BUG=chromium:515240
TEST=run power_LoadTest with control.web_1hour control file

Change-Id: I9d155a31df88a7ad4c25b0757743b0a2c0210a1f
Reviewed-on: https://chromium-review.googlesource.com/289826
Reviewed-by: Eric Caruso <ejcaruso@chromium.org>
Tested-by: Derek Basehore <dbasehore@chromium.org>
Commit-Queue: Derek Basehore <dbasehore@chromium.org>
1 file changed