vendor/pac: 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
Update chromium_prebuilt.sh for 5.0

Change-Id: Idfd9b28f048447bf69b0f1c710b0ee354eff829a
Fix-ups for prebuilt Chromium

- Make copying far more reliable, even on non-clean builds
- Use $OUT in script in all cases, apparently get_build_var OUT_DIR isn't reliable.
envsetup.sh, please -_-

Change-Id: I27fa9bc7a043c32bcb29e7667e86b40226222a5a
Prebuilt chromium by default

Change-Id: If7e9b0b7dfdf7b6b676cf61feaefcb49f8bde0aa
Merge "vendor/pac: Add chromium_prebuilt.sh" into pac-5.0
Merge "Update chromium_prebuilt.sh for 5.0" into pac-5.0
Merge "Fix-ups for prebuilt Chromium" into pac-5.0
Merge "Prebuilt chromium by default" into pac-5.0
Merge PAC-man/pac-5.0 into pac-5.0

Change-Id: I01ae35d346a72d6d992e0e6ec1ba7cdd1777ce25