Add metrics constant for platform compat UI.

Bug: 138280620
Test: builds
Exempt-From-Owner-Approval: Cherry-pick
Merged-In: I1a1a708596ad003a7c95906fe9514db6ec518dfc
Change-Id: I1a1a708596ad003a7c95906fe9514db6ec518dfc
diff --git a/stats/enums/app/settings_enums.proto b/stats/enums/app/settings_enums.proto
index f817c9b..2b702ba 100644
--- a/stats/enums/app/settings_enums.proto
+++ b/stats/enums/app/settings_enums.proto
@@ -2406,4 +2406,9 @@
     // CATEGORY: SETTINGS
     // OS: Q
     SETTINGS_AWARE_DISPLAY = 1750;
+
+    // OPEN: Settings > Developer Options > Platform Compat
+    // CATEGORY: SETTINGS
+    // OS: R
+    SETTINGS_PLATFORM_COMPAT_DASHBOARD = 1805;    
 }