Add UseCounters for non-standard, internally unused reflected attributes

Source/core/frame/UseCounter.h

Index: Source/core/frame/UseCounter.h
diff --git a/Source/core/frame/UseCounter.h b/Source/core/frame/UseCounter.h
index 29d2fd63c11d073b63c606fcf068846b04b35911..2bcba9d2b1a8c878c8fad9c886d2d4d4cc3b3aa4 100644
--- a/Source/core/frame/UseCounter.h
+++ b/Source/core/frame/UseCounter.h
@@ -491,6 +491,11 @@ public:
         WheelEventWheelDelta = 493,
         SendBeacon = 494,
         SendBeaconQuotaExceeded = 495,
+        HTMLHtmlElementVersion = 496,
+        HTMLMetaElementScheme = 497,
+        HTMLObjectElementStandby = 498,
+        HTMLTableCellElementChar = 499,
+        HTMLTableCellElementCharOff = 500,
         // Add new features immediately above this line. Don't change assigned
         // numbers of any item, and don't reuse removed slots.
         // Also, run update_use_counter_feature_enum.py in chromium/src/tools/metrics/histograms/