Battery Status API: implementation for Linux.

Implementation of the Battery Status API for the Linux platform.
Implementation uses DBus to talk to org.freedesktop.UPower service
to obtain battery information.

BUG=122593
TEST=http://jsbin.com/battery-status-test (manual)
TBR=brettw@chromium.org
NOTRY=true

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=289372

Review URL: https://codereview.chromium.org/436683002

Cr-Commit-Position: refs/heads/master@{#289431}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289431 0039d316-1c4b-4281-b951-d872f2087c98
6 files changed