Count usage of <meter> with various -webkit-appearance values.

third_party/WebKit/Source/core/html/HTMLMeterElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLMeterElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLMeterElement.cpp b/third_party/WebKit/Source/core/html/HTMLMeterElement.cpp
index 97587fa12436bb251c3af6388e18a70ad298107d..d91601fe2f967b051a7ca07cb63fa401e8c5b34f 100644
--- a/third_party/WebKit/Source/core/html/HTMLMeterElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLMeterElement.cpp
@@ -57,6 +57,28 @@ PassRefPtrWillBeRawPtr<HTMLMeterElement> HTMLMeterElement::create(Document& docu
 
 LayoutObject* HTMLMeterElement::createLayoutObject(const ComputedStyle& style)
 {
+    switch (style.appearance()) {
+    case ContinuousCapacityLevelIndicatorPart:
+        UseCounter::count(document(), UseCounter::MeterElementWithContinuousCapacityAppearance);
+        break;
+    case DiscreteCapacityLevelIndicatorPart:
+        UseCounter::count(document(), UseCounter::MeterElementWithDiscreteCapacityAppearance);
+        break;
+    case MeterPart:
+        UseCounter::count(document(), UseCounter::MeterElementWithMeterAppearance);
+        break;
+    case NoControlPart:
+        UseCounter::count(document(), UseCounter::MeterElementWithNoneAppearance);
+        break;
+    case RatingLevelIndicatorPart:
+        UseCounter::count(document(), UseCounter::MeterElementWithRatingAppearance);
+        break;
+    case RelevancyLevelIndicatorPart:
+        UseCounter::count(document(), UseCounter::MeterElementWithRelevancyAppearance);
+        break;
+    default:

[kochi, 2015/11/06 06:14:26]

Shall we count this other appearances to get the total usage (as a denominator
for each)?

[tkent, 2015/11/06 08:31:36]

UseCounter::MeterElement would be the denominator.

+        break;
+    }
     if (openShadowRoot() || !LayoutTheme::theme().supportsMeter(style.appearance()))
         return LayoutObject::createObject(this, style);
     return new LayoutMeter(this);