Add UseCounters for lang and xml:lang content attributes.

Source/core/html/HTMLElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004-2008, 2013, 2014 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2011 Motorola Mobility. All rights reserved.
  *
  * 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
@@ skipping 27 matching lines @@
 #include "core/dom/ElementTraversal.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/NodeTraversal.h"
 #include "core/dom/Text.h"
 #include "core/dom/shadow/ElementShadow.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/editing/markup.h"
 #include "core/events/EventListener.h"
 #include "core/events/KeyboardEvent.h"
 #include "core/frame/Settings.h"
+#include "core/frame/UseCounter.h"
 #include "core/html/HTMLBRElement.h"
 #include "core/html/HTMLFormElement.h"
 #include "core/html/HTMLInputElement.h"
 #include "core/html/HTMLMenuElement.h"
 #include "core/html/HTMLTemplateElement.h"
 #include "core/html/HTMLTextFormControlElement.h"
 #include "core/html/parser/HTMLParserIdioms.h"
 #include "core/rendering/RenderObject.h"
+#include "platform/Language.h"
 #include "platform/text/BidiResolver.h"
 #include "platform/text/BidiTextRun.h"
 #include "platform/text/TextRunIterator.h"
 #include "wtf/StdLibExtras.h"
 #include "wtf/text/CString.h"
 
 namespace blink {
 
 using namespace HTMLNames;
 using namespace WTF;
@@ skipping 67 matching lines @@
 {
     addPropertyToPresentationAttributeStyle(style, CSSPropertyBorderWidth, parseBorderWidthAttribute(value), CSSPrimitiveValue::CSS_PX);
     addPropertyToPresentationAttributeStyle(style, CSSPropertyBorderStyle, CSSValueSolid);
 }
 
 void HTMLElement::mapLanguageAttributeToLocale(const AtomicString& value, MutableStylePropertySet* style)
 {
     if (!value.isEmpty()) {
         // Have to quote so the locale id is treated as a string instead of as a CSS keyword.
         addPropertyToPresentationAttributeStyle(style, CSSPropertyWebkitLocale, quoteCSSString(value));
+
+        // FIXME: Remove the following UseCounter code when we collect enough
+        // data.
+        UseCounter::count(document(), UseCounter::LangAttribute);
+        if (isHTMLHtmlElement(*this))
+            UseCounter::count(document(), UseCounter::LangAttributeOnHTML);
+        else if (isHTMLBodyElement(*this))
+            UseCounter::count(document(), UseCounter::LangAttributeOnBody);
+        String htmlLanguage = value.string();
+        size_t firstSeparator = htmlLanguage.find('-');
+        if (firstSeparator != kNotFound)
+            htmlLanguage = htmlLanguage.left(firstSeparator);
+        String uiLanguage = defaultLanguage();
+        firstSeparator = uiLanguage.find('-');
+        if (firstSeparator != kNotFound)
+            uiLanguage = uiLanguage.left(firstSeparator);
+        firstSeparator = uiLanguage.find('_');
+        if (firstSeparator != kNotFound)
+            uiLanguage = uiLanguage.left(firstSeparator);
+        if (!equalIgnoringCase(htmlLanguage, uiLanguage))
+            UseCounter::count(document(), UseCounter::LangAttributeDoesNotMatchToUILocale);
     } else {
         // The empty string means the language is explicitly unknown.
         addPropertyToPresentationAttributeStyle(style, CSSPropertyWebkitLocale, CSSValueAuto);
     }
 }
 
 bool HTMLElement::isPresentationAttribute(const QualifiedName& name) const
 {
     if (name == alignAttr || name == contenteditableAttr || name == hiddenAttr || name == langAttr || name.matches(XMLNames::langAttr) || name == draggableAttr || name == dirAttr)
         return true;
@@ skipping 850 matching lines @@
 #ifndef NDEBUG
 
 // For use in the debugger
 void dumpInnerHTML(blink::HTMLElement*);
 
 void dumpInnerHTML(blink::HTMLElement* element)
 {
     printf("%s\n", element->innerHTML().ascii().data());
 }
 #endif