base: fix init handling of tinted system bar

force same behaviour like after changing setting

PS. 2 :
   fix initial background color

PS. 3 :
   make sure initial gradient is 0

Change-Id: I87eddcaa5223c1af15fa8c089f22ed9cb4774f7b
Merge remote-tracking branch 'omni/android-4.4' into android-4.4