Add UseCounters for non-standard, internally unused reflected attributes

http://whatwg.org/html#htmlhtmlelement
http://whatwg.org/html#htmlmetaelement
http://whatwg.org/html#htmlobjectelement
http://whatwg.org/html#htmltablecellelement

None of these attributes are used internally, so the only way sites
can depend on them is via these bindings.

Review URL: https://codereview.chromium.org/428893002

git-svn-id: svn://svn.chromium.org/blink/trunk@179140 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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

@@ -486,6 +486,11 @@ 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/

third_party/WebKit/Source/core/html/HTMLHtmlElement.idl

@@ -18,5 +18,5 @@
  */
 
 interface HTMLHtmlElement : HTMLElement {
-    [Reflect] attribute DOMString version;
+    [Reflect, MeasureAs=HTMLHtmlElementVersion] attribute DOMString version;
 };

third_party/WebKit/Source/core/html/HTMLMetaElement.idl

@@ -21,5 +21,5 @@ interface HTMLMetaElement : HTMLElement {
     [Reflect] attribute DOMString content;
     [Reflect=http_equiv] attribute DOMString httpEquiv;
     [Reflect] attribute DOMString name;
-    [Reflect] attribute DOMString scheme;
+    [Reflect, MeasureAs=HTMLMetaElementScheme] attribute DOMString scheme;
 };

third_party/WebKit/Source/core/html/HTMLObjectElement.idl

@@ -33,7 +33,7 @@
     [Reflect] attribute DOMString height;
     [Reflect] attribute long hspace;
     [Reflect] attribute DOMString name;
-    [Reflect] attribute DOMString standby;
+    [Reflect, MeasureAs=HTMLObjectElementStandby] attribute DOMString standby;
     [Reflect] attribute DOMString type;
     [Reflect] attribute DOMString useMap;
     [Reflect] attribute long vspace;

third_party/WebKit/Source/core/html/HTMLTableCellElement.idl

@@ -24,8 +24,8 @@ interface HTMLTableCellElement : HTMLElement {
     [Reflect] attribute DOMString align;
     [Reflect] attribute DOMString axis;
     [Reflect, TreatNullAs=EmptyString] attribute DOMString bgColor;
-    [Reflect=char] attribute DOMString ch;
-    [Reflect=charoff] attribute DOMString chOff;
+    [Reflect=char, MeasureAs=HTMLTableCellElementChar] attribute DOMString ch;
+    [Reflect=charoff, MeasureAs=HTMLTableCellElementCharOff] attribute DOMString chOff;
     attribute long colSpan;
     [Reflect, TreatNullAs=NullString] attribute DOMString headers;
     [Reflect] attribute DOMString height;