Add a WebDocument::watchCssSelectors(selectors)

Source/core/page/UseCounter.cpp

Index: Source/core/page/UseCounter.cpp
diff --git a/Source/core/page/UseCounter.cpp b/Source/core/page/UseCounter.cpp
index c7788ce952c3b6b6b661893a35cdb06e57030806..afe246724b4e6ecae3498b599d57d0e7ee78038a 100644
--- a/Source/core/page/UseCounter.cpp
+++ b/Source/core/page/UseCounter.cpp
@@ -497,6 +497,7 @@ int UseCounter::mapCSSPropertyIdToCSSSampleIdForHistogram(int id)
     case CSSPropertyMaskSourceType: return 435;
     case CSSPropertyIsolation: return 436;
     case CSSPropertyObjectPosition: return 437;
+    case CSSPropertyInternalCallback: return 438;
 
     // Add new features above this line (don't change the assigned numbers of the existing
     // items) and update maximumCSSSampleId() with the new maximum value.
@@ -511,7 +512,7 @@ int UseCounter::mapCSSPropertyIdToCSSSampleIdForHistogram(int id)
     return 0;
 }
 
-static int maximumCSSSampleId() { return 437; }
+static int maximumCSSSampleId() { return 438; }
 
 UseCounter::UseCounter()
 {