scripts: build-chromium: Initial commit

* Script based on https://github.com/LineageOS/scripts/blob/45d62060bfaca101f52b14d0e61b295b6921fa40/build-webview/build-webview.sh
* Patches taken from https://github.com/GrapheneOS/Vanadium/tree/422333246c7cd40cec02aac751ed8d3637c652e9/patches

Change-Id: Id0df182c99d2cf2c372af12f0f93be74b8908756
26 files changed
tree: 1434f7966e75f0c7a3588b7ef9f2b06cf3837132
  1. aosp-merger/
  2. build-chromium/
  3. repo/