Introduce new Theme: Auto

UI Change in Change 337421.

Google-Bug-Id: b/205564309
Release-Notes: skip
Change-Id: I724377635dab54373ceb1062030de833794fa1b3

Documentation/rest-api-accounts.txt

diff --git a/Documentation/rest-api-accounts.txt b/Documentation/rest-api-accounts.txt
index ae0c0a6..64845da 100644
--- a/Documentation/rest-api-accounts.txt
+++ b/Documentation/rest-api-accounts.txt
@@ -2658,7 +2658,7 @@
 Allowed values are `10`, `25`, `50`, `100`.
 |`theme`                        ||
 Which theme to use.
-Allowed values are `DARK` or `LIGHT`.
+Allowed values are `AUTO` or `DARK` or `LIGHT`.
 |`expand_inline_diffs`          |not set if `false`|
 Whether to expand diffs inline instead of opening as separate page
 (Gerrit web app UI only).
@@ -2729,7 +2729,7 @@
 Allowed values are `10`, `25`, `50`, `100`.
 |`theme`                        |optional|
 Which theme to use.
-Allowed values are `DARK` or `LIGHT`.
+Allowed values are `AUTO` or `DARK` or `LIGHT`.
 |`expand_inline_diffs`          |not set if `false`|
 Whether to expand diffs inline instead of opening as separate page
 (Gerrit web app UI only).