Wake Lock API: Add checks for feature policy.

Added checks for feature policy attribute. This fixes all feature policy
related tests.

BUG=862460,257511

Change-Id: I6258c41dcca164f7c6584ba4a387860237ca3ba3
Reviewed-on: https://chromium-review.googlesource.com/c/1343193
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Ian Clelland <iclelland@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: Mrunal Kapade <mrunal.kapade@intel.com>
Cr-Commit-Position: refs/heads/master@{#615985}
9 files changed