GitLab

1. rename text styles. Most of them are prefixed by "White".
2. add new text styles. Dark text styles are missing in styles.xml.

For more info, see go/clanktext.

Bug: 775198
Change-Id: I0f4679d022a671a5080d0a587fef8d4c35f05c31
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2033724
Commit-Queue: Lijin Shen <lazzzis@google.com>
Reviewed-by: Theresa  <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737961}