Add internals.isCSSPropertyUseCounted functionality

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

Index: third_party/WebKit/Source/core/frame/UseCounter.cpp
diff --git a/third_party/WebKit/Source/core/frame/UseCounter.cpp b/third_party/WebKit/Source/core/frame/UseCounter.cpp
index 15eb00c980c79d02610521b0b8ec5bf8a2a85790..7b95f95ca1be6d00b5d0d26b7c6c7cf49c247a22 100644
--- a/third_party/WebKit/Source/core/frame/UseCounter.cpp
+++ b/third_party/WebKit/Source/core/frame/UseCounter.cpp
@@ -680,6 +680,25 @@ bool UseCounter::isCounted(Document& document, Feature feature)
     return host->useCounter().hasRecordedMeasurement(feature);
 }
 
+bool UseCounter::isCounted(CSSPropertyID unresolvedProperty)
+{
+    return m_CSSFeatureBits.quickGet(unresolvedProperty);
+}
+
+
+bool UseCounter::isCounted(Document& document, const String& string)
+{
+    Frame* frame = document.frame();
+    if (!frame)
+        return false;
+    FrameHost* host = frame->host();
+    if (!host)
+        return false;
+    CSSPropertyID propertyID = cssPropertyID(string);
+    ASSERT(propertyID != CSSPropertyInvalid);

[Timothy Loh, 2016/02/24 03:40:35]

this needs to be defensive if you don't want clusterfuzz to yell at you

[nainar, 2016/02/24 04:29:53]

Done.

+    return host->useCounter().isCounted(propertyID);
+}
+
 void UseCounter::count(const ExecutionContext* context, Feature feature)
 {
     if (!context)