Enable/disable hardware rendering on windows by application tag

Previously, hardware rendering cannot be enabled or disabled
on windows created without a parent activity (e.g. by services)
by setting the <application> tag, "android:hardwareAccelerated"
in AndroidManifest.xml. It's enabled by default in Android L
from the commit, 5e1565ea.
This patch provides a way of setting hardware rendering for
that case.

Change-Id: I60ee9566e99db39cd661fe6f196f43c3968b311a
Signed-off-by: Dohyun Lee <dohyun.lee@lge.com>