vendor/liquid: Add chromium_prebuilt.sh

This script will pull the necessary libs from a complete build and generate proper
makefiles in order to support using a prebuilt Chromium. Files are placed in
prebuilts/chromium/-devicenamehere-, and are not tracked by git, so they are completely
out of the way.

PS3:
-replace git -C with params compatible to old git versions

Change-Id: I3141defcbd4108178881f7203f3105aecc27378b
Fix prebuilt chromium

10x Jose for the idea

Change-Id: I856eb592cff86158c93505bedb55b5c4518da25c

Conflicts:
	config/common.mk