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: I08ce58a8644970a2a18407e83ad317a72a2dad10
Signed-off-by: Dohyun Lee <dohyun.lee@lge.com>