How to update tensorflow-text:

1. Ensure your current working directory is set to the root of the Chromium
   checkout (src/)

2. Execute the update script to fetch upstream code at the latest commit.
   `./third_party/tensorflow-text/update.sh`

   This script maintains an allowlist of files needed by Chromium, and updates
   tensorflow-text by executing the following steps in order:
   a) Shallow-clones the upstream repository to a temporary folder (/tmp/text).
   b) Deletes existing code (third_party/tensorflow-text/src/*).
   c) Copies the allowlisted files to third_party/tensorflow-text/src/.
   d) Deletes the temporary folder.
   e) Updates the commit hash and date of the latest commit in README.chromium.

3. Apply the local Chromium patches in third_party/tensorflow-text/patches/:
   `git apply third_party/tensorflow-text/patches/*.patch`

4. Verify success by building Chrome.

5. Commit and upload to Gerrit for review.