Add Chromium prebuilt and fixup device specific OUT dir [1/2]

Updated code for Lollipop by Omnirom and Paranoid

IMPORTANT: remember to add:
export USE_PREBUILT_CHROMIUM=1
in the build script!

Fixed the webview apk dir and the javalib.jar
huge thanks to Marc @Grondinm

Change-Id: I53f20549a0f96df6a2f6a33ad02b16ee180c66dd