Just wondering, couldn't be an option to do something like G2 xposed does? (expand the action bar color in padding and add the gradient over it, and do the inverse to the navigation bar with the same color added on the statusbar padding):
Sorry for mentioning you again on this thread, it's the last time I'm going to do it, for real.
But I feel like I had to..
Today I tested G2 xposed module (Yep, it works flawless on Nexus 5..), which got thread closed from ...
Guys, jump to the SuperNexus 3.0 (4.3) thread :D