Slightly increase the cpu.shares to background rendering.
Slightly increase the cpu.shares to background rendering.

This allows us to put even lower priority processes like the update-engine
lower than background rendering. This is important to ensuring we don't hear
jank if audio from video is playing from a background tab while AU
is in progress.

BUG=chromium-os:36229
TEST=Ran with it on a Snow device.

Change-Id: I3dec5d76689cc1b6142db2dd739784abe5bfc82f
Reviewed-on: https://gerrit.chromium.org/gerrit/38886
Reviewed-by: Chris Masone <98e3d65c6b0e9e2391eb4c2e8b1e572b77e544ed@chromium.org>
Commit-Ready: Chris Sosa <959d3d631fb6f17f1b07f751372041a1edb210d1@chromium.org>
Tested-by: Chris Sosa <959d3d631fb6f17f1b07f751372041a1edb210d1@chromium.org>

chadversary/chromiumos.platform.login_manager,chadversary/chromiumos.platform.login_manager,chadversary/chromiumos.platform.login_manager