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

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

 /*
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 39 matching lines @@
 
 PassRefPtrWillBeRawPtr<HTMLMeterElement> HTMLMeterElement::create(Document& document)
 {
     RefPtrWillBeRawPtr<HTMLMeterElement> meter = adoptRefWillBeNoop(new HTMLMeterElement(document));
     meter->ensureUserAgentShadowRoot();
     return meter.release();
 }
 
 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);
 }
 
 void HTMLMeterElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
 {
     if (name == valueAttr || name == minAttr || name == maxAttr || name == lowAttr || name == highAttr || name == optimumAttr)
         didElementStateChange();
     else
@@ skipping 147 matching lines @@
     lazyReattachIfAttached();
 }
 
 DEFINE_TRACE(HTMLMeterElement)
 {
     visitor->trace(m_value);
     LabelableElement::trace(visitor);
 }
 
 } // namespace