Chromium change:
https://github.com/chromium/chromium/commit/3dec34616aaf4298ac30aee57bebfe0b50af6715
Copy zip-related funcs build_utils -> zip_helpers
Non-android scripts use these helpers, so this moves them
outside of the //build/android directory.
This also modifies the helpers in the following ways:
* Renamed them.
* Added more assert checks about valid paths
* Fixed zip_directory() adding \s instead of /s on windows
* Merged in zipalign logic
* Changed compress_fn -> compress= (was unused)
* Do not call atomic_output from zip_directory()
* Updated all callers to do so explicitly.
Bug: 1428082
goodov