Add use counters for a number of extensions and non-standard APIs

Source/core/html/HTMLPreElement.cpp

Index: Source/core/html/HTMLPreElement.cpp
diff --git a/Source/core/html/HTMLPreElement.cpp b/Source/core/html/HTMLPreElement.cpp
index 830f015f8413b80701f3b6d6a543e7112023b217..49a029a92b452995e2c2d5223a7f5c474c3967dd 100644
--- a/Source/core/html/HTMLPreElement.cpp
+++ b/Source/core/html/HTMLPreElement.cpp
@@ -27,6 +27,7 @@
 #include "CSSValueKeywords.h"
 #include "HTMLNames.h"
 #include "core/css/StylePropertySet.h"
+#include "core/frame/UseCounter.h"
 
 namespace WebCore {
 
@@ -52,10 +53,12 @@ bool HTMLPreElement::isPresentationAttribute(const QualifiedName& name) const
 
 void HTMLPreElement::collectStyleForPresentationAttribute(const QualifiedName& name, const AtomicString& value, MutableStylePropertySet* style)
 {
-    if (name == wrapAttr)
+    if (name == wrapAttr) {
+        UseCounter::count(document(), UseCounter::HTMLPreElementWrap);

[eseidel, 2014/05/02 05:14:09]

i see, I thought this was HTMLPreElement::parseAttribute, which is why I asked
the question nbarth answered.  I see now this is really a separatge countable
path.

         style->setProperty(CSSPropertyWhiteSpace, CSSValuePreWrap);
-    else
+    } else {
         HTMLElement::collectStyleForPresentationAttribute(name, value, style);
+    }
 }
 
 }