Add UI metrics logging for color contrast.

Bug: 241805782
Test: manual

Change-Id: I792b2ba7116841d8be727ed27511859fe3eb6274
diff --git a/stats/enums/app/settings_enums.proto b/stats/enums/app/settings_enums.proto
index 28fc3a6..0a1d9f0 100644
--- a/stats/enums/app/settings_enums.proto
+++ b/stats/enums/app/settings_enums.proto
@@ -4567,6 +4567,11 @@
     // CATEGORY: SETTINGS
     // OS: V
     SATELLITE_SETTING = 2071;
+
+    // OPEN: Settings > Accessibility -> Color Contrast
+    // CATEGORY: SETTINGS
+    // OS: V
+    ACCESSIBILITY_COLOR_CONTRAST = 2072;
 }
 
 // Battery Saver schedule types.