Add internals.isCSSPropertyUseCounted functionality

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

 /*
  * Copyright (C) 2012 Google, Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 662 matching lines @@
 {
     Frame* frame = document.frame();
     if (!frame)
         return false;
     FrameHost* host = frame->host();
     if (!host)
         return false;
     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);
+
+    if (propertyID != CSSPropertyInvalid)

[Timothy Loh, 2016/02/26 06:37:45]

better to rearrange this so the success case is at the very bottom. otherwise
right now the return statements from top to bottom are [fail, fail, success,
fail], which is weird.

[nainar, 2016/02/26 06:59:55]

Done.

+        return host->useCounter().isCounted(propertyID);
+    return false;
+}
+
 void UseCounter::count(const ExecutionContext* context, Feature feature)
 {
     if (!context)
         return;
     if (context->isDocument()) {
         count(*toDocument(context), feature);
         return;
     }
     if (context->isWorkerGlobalScope())
         toWorkerGlobalScope(context)->countFeature(feature);
@@ skipping 66 matching lines @@
 UseCounter* UseCounter::getFrom(const StyleSheetContents* sheetContents)
 {
     // FIXME: We may want to handle stylesheets that have multiple owners
     //        https://crbug.com/242125
     if (sheetContents && sheetContents->hasSingleOwnerNode())
         return getFrom(sheetContents->singleOwnerDocument());
     return 0;
 }
 
 } // namespace blink