Implement the inert attribute

third_party/WebKit/Source/core/frame/#UseCounter.h#

Index: third_party/WebKit/Source/core/frame/#UseCounter.h#
diff --git a/third_party/WebKit/Source/core/frame/UseCounter.h b/third_party/WebKit/Source/core/frame/#UseCounter.h#
similarity index 98%
copy from third_party/WebKit/Source/core/frame/UseCounter.h
copy to third_party/WebKit/Source/core/frame/#UseCounter.h#
index d0a928df003d8f39f8d7748fd224e8586cc372a7..57666efbf438566ee8a22d62b2f3afa08920e0b4 100644
--- a/third_party/WebKit/Source/core/frame/UseCounter.h
+++ b/third_party/WebKit/Source/core/frame/#UseCounter.h#
@@ -240,6 +240,7 @@ class CORE_EXPORT UseCounter {
     HTMLMediaElementPauseAtFragmentEnd = 282,
     PrefixedWindowURL = 283,
     WindowOrientation = 285,
+    DOMStringListContains = 286,
     DocumentCaptureEvents = 287,
     DocumentReleaseEvents = 288,
     WindowCaptureEvents = 289,
@@ -602,6 +603,10 @@ class CORE_EXPORT UseCounter {
     V8DOMError_Constructor = 816,
     V8DOMError_Name_AttributeGetter = 817,
     V8DOMError_Message_AttributeGetter = 818,
+    V8Location_AncestorOrigins_AttributeGetter = 823,
+    V8IDBDatabase_ObjectStoreNames_AttributeGetter = 824,
+    V8IDBObjectStore_IndexNames_AttributeGetter = 825,
+    V8IDBTransaction_ObjectStoreNames_AttributeGetter = 826,
     TextInputFired = 830,
     V8TextEvent_Data_AttributeGetter = 831,
     V8TextEvent_InitTextEvent_Method = 832,
@@ -611,6 +616,10 @@ class CORE_EXPORT UseCounter {
     SRIElementIntegrityAttributeButIneligible = 838,
     FormDataAppendNull = 843,
     NonHTMLElementSetAttributeNodeFromHTMLDocumentNameNotLowercase = 845,
+    DOMStringList_Item_AttributeGetter_IndexedDB = 846,
+    DOMStringList_Item_AttributeGetter_Location = 847,
+    DOMStringList_Contains_Method_IndexedDB = 848,
+    DOMStringList_Contains_Method_Location = 849,
     NavigatorVibrate = 850,
     NavigatorVibrateSubFrame = 851,
     V8XPathEvaluator_Constructor = 853,
@@ -1426,21 +1435,10 @@ class CORE_EXPORT UseCounter {
     V8AssigmentExpressionLHSIsCallInStrict = 1765,
     V8PromiseConstructorReturnedUndefined = 1766,
     FormSubmittedWithUnclosedFormControl = 1767,
-    DocumentCompleteURLHTTPContainingNewline = 1768,
-    DocumentCompleteURLHTTPContainingLessThan = 1769,
-    DocumentCompleteURLHTTPContainingNewlineAndLessThan = 1770,
-    DocumentCompleteURLNonHTTPContainingNewlineOrLessThan = 1771,
-    CSSSelectorInternalMediaControlsTextTrackList = 1772,
-    CSSSelectorInternalMediaControlsTextTrackListItem = 1773,
-    CSSSelectorInternalMediaControlsTextTrackListItemInput = 1774,
-    CSSSelectorInternalMediaControlsTextTrackListKindCaptions = 1775,
-    CSSSelectorInternalMediaControlsTextTrackListKindSubtitles = 1776,
-    ScrollbarUseVerticalScrollbarButton = 1777,
-    ScrollbarUseVerticalScrollbarThumb = 1778,
-    ScrollbarUseVerticalScrollbarTrack = 1779,
-    ScrollbarUseHorizontalScrollbarButton = 1780,
-    ScrollbarUseHorizontalScrollbarThumb = 1781,
-    ScrollbarUseHorizontalScrollbarTrack = 1782,
+    DocumentCompleteURLContainingNewline = 1768,
+    DocumentCompleteURLContainingOpenBrace = 1769,
+    DocumentCompleteURLContainingNewlineAndOpenBrace = 1770,
+    InertAttribute = 1771,
 
     // Add new features immediately above this line. Don't change assigned
     // numbers of any item, and don't reuse removed slots.