Add support for media attribute on link

third_party/WebKit/Source/core/html/parser/HTMLPreloadScanner.cpp

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2009 Torch Mobile, Inc. http://www.torchmobile.com/
  * Copyright (C) 2010 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.
@@ skipping 468 matching lines @@
     const Checkpoint& checkpoint = m_checkpoints[checkpointIndex];
     m_predictedBaseElementURL = checkpoint.predictedBaseElementURL;
     m_inStyle = checkpoint.inStyle;
     m_isAppCacheEnabled = checkpoint.isAppCacheEnabled;
     m_isCSPEnabled = checkpoint.isCSPEnabled;
     m_templateCount = checkpoint.templateCount;
     m_cssScanner.reset();
     m_checkpoints.clear();
 }
 
-void TokenPreloadScanner::scan(const HTMLToken& token, const SegmentedString& source, PreloadRequestStream& requests)
+void TokenPreloadScanner::scan(const HTMLToken& token, const SegmentedString& source, PreloadRequestStream& requests, ViewportDescriptionWrapper* viewport)
 {
-    scanCommon(token, source, requests);
+    scanCommon(token, source, requests, viewport);
 }
 
-void TokenPreloadScanner::scan(const CompactHTMLToken& token, const SegmentedString& source, PreloadRequestStream& requests)
+void TokenPreloadScanner::scan(const CompactHTMLToken& token, const SegmentedString& source, PreloadRequestStream& requests, ViewportDescriptionWrapper* viewport)
 {
-    scanCommon(token, source, requests);
+    scanCommon(token, source, requests, viewport);
 }
 
-static void handleMetaViewport(const String& attributeValue, const CachedDocumentParameters* documentParameters, MediaValuesCached* mediaValues)
+static void handleMetaViewport(const String& attributeValue, const CachedDocumentParameters* documentParameters, MediaValuesCached* mediaValues, ViewportDescriptionWrapper* viewport)
 {
     if (!documentParameters->viewportMetaEnabled)
         return;
     ViewportDescription description(ViewportDescription::ViewportMeta);
     HTMLMetaElement::getViewportDescriptionFromContentAttribute(attributeValue, description, nullptr, documentParameters->viewportMetaZeroValuesQuirk);
+    if (viewport) {
+        viewport->description = description;
+        viewport->set = true;
+    }
     FloatSize initialViewport(mediaValues->deviceWidth(), mediaValues->deviceHeight());
     PageScaleConstraints constraints = description.resolve(initialViewport, documentParameters->defaultViewportMinWidth);
-    mediaValues->setViewportHeight(constraints.layoutSize.height());
-    mediaValues->setViewportWidth(constraints.layoutSize.width());
+    mediaValues->overrideViewportDimensions(constraints.layoutSize.width(), constraints.layoutSize.height());
 }
 
 static void handleMetaReferrer(const String& attributeValue, CachedDocumentParameters* documentParameters, CSSPreloadScanner* cssScanner)
 {
     if (attributeValue.isEmpty() || attributeValue.isNull() || !SecurityPolicy::referrerPolicyFromString(attributeValue, &documentParameters->referrerPolicy)) {
         documentParameters->referrerPolicy = ReferrerPolicyDefault;
     }
     cssScanner->setReferrerPolicy(documentParameters->referrerPolicy);
 }
 
 template <typename Token>
-static void handleMetaNameAttribute(const Token& token, CachedDocumentParameters* documentParameters, MediaValuesCached* mediaValues, CSSPreloadScanner* cssScanner)
+static void handleMetaNameAttribute(const Token& token, CachedDocumentParameters* documentParameters, MediaValuesCached* mediaValues, CSSPreloadScanner* cssScanner, ViewportDescriptionWrapper* viewport)
 {
     const typename Token::Attribute* nameAttribute = token.getAttributeItem(nameAttr);
     if (!nameAttribute)
         return;
 
     String nameAttributeValue(nameAttribute->value());
     const typename Token::Attribute* contentAttribute = token.getAttributeItem(contentAttr);
     if (!contentAttribute)
         return;
 
     String contentAttributeValue(contentAttribute->value());
     if (equalIgnoringCase(nameAttributeValue, "viewport")) {
-        handleMetaViewport(contentAttributeValue, documentParameters, mediaValues);
+        handleMetaViewport(contentAttributeValue, documentParameters, mediaValues, viewport);
         return;
     }
 
     if (equalIgnoringCase(nameAttributeValue, "referrer")) {
         handleMetaReferrer(contentAttributeValue, documentParameters, cssScanner);
     }
 }
 
 template <typename Token>
-void TokenPreloadScanner::scanCommon(const Token& token, const SegmentedString& source, PreloadRequestStream& requests)
+void TokenPreloadScanner::scanCommon(const Token& token, const SegmentedString& source, PreloadRequestStream& requests, ViewportDescriptionWrapper* viewport)
 {
     if (!m_documentParameters->doHtmlPreloadScanning)
         return;
 
     // Disable preload for documents with AppCache.
     if (m_isAppCacheEnabled)
         return;
 
     // http://crbug.com/434230 Disable preload for documents with CSP <meta> tags
     if (m_isCSPEnabled)
@@ skipping 53 matching lines @@
                 if (equalIgnoringCase(equivAttributeValue, "content-security-policy")) {
                     m_isCSPEnabled = true;
                 } else if (equalIgnoringCase(equivAttributeValue, "accept-ch")) {
                     const typename Token::Attribute* contentAttribute = token.getAttributeItem(contentAttr);
                     if (contentAttribute)
                         m_clientHintsPreferences.updateFromAcceptClientHintsHeader(contentAttribute->value(), nullptr);
                 }
                 return;
             }
 
-            handleMetaNameAttribute(token, m_documentParameters.get(), m_mediaValues.get(), &m_cssScanner);
+            handleMetaNameAttribute(token, m_documentParameters.get(), m_mediaValues.get(), &m_cssScanner, viewport);
         }
 
         if (match(tagImpl, pictureTag)) {
             m_inPicture = true;
             m_pictureData = PictureData();
             return;
         }
 
         StartTagScanner scanner(tagImpl, m_mediaValues);
         scanner.processAttributes(token.attributes());
@@ skipping 28 matching lines @@
 
 HTMLPreloadScanner::~HTMLPreloadScanner()
 {
 }
 
 void HTMLPreloadScanner::appendToEnd(const SegmentedString& source)
 {
     m_source.append(source);
 }
 
-void HTMLPreloadScanner::scan(ResourcePreloader* preloader, const KURL& startingBaseElementURL)
+void HTMLPreloadScanner::scan(ResourcePreloader* preloader, const KURL& startingBaseElementURL, ViewportDescriptionWrapper* viewport)
 {
     ASSERT(isMainThread()); // HTMLTokenizer::updateStateFor only works on the main thread.
 
     TRACE_EVENT1("blink", "HTMLPreloadScanner::scan", "source_length", m_source.length());
 
     // When we start scanning, our best prediction of the baseElementURL is the real one!
     if (!startingBaseElementURL.isEmpty())
         m_scanner.setPredictedBaseElementURL(startingBaseElementURL);
 
     PreloadRequestStream requests;
 
     while (m_tokenizer->nextToken(m_source, m_token)) {
         if (m_token.type() == HTMLToken::StartTag)
             m_tokenizer->updateStateFor(attemptStaticStringCreation(m_token.name(), Likely8Bit));
-        m_scanner.scan(m_token, m_source, requests);
+        m_scanner.scan(m_token, m_source, requests, viewport);
         m_token.clear();
     }
 
     preloader->takeAndPreload(requests);
 }
 
 CachedDocumentParameters::CachedDocumentParameters(Document* document)
 {
     ASSERT(isMainThread());
     ASSERT(document);
     doHtmlPreloadScanning = !document->settings() || document->settings()->doHtmlPreloadScanning();
     defaultViewportMinWidth = document->viewportDefaultMinWidth();
     viewportMetaZeroValuesQuirk = document->settings() && document->settings()->viewportMetaZeroValuesQuirk();
     viewportMetaEnabled = document->settings() && document->settings()->viewportMetaEnabled();
     referrerPolicy = ReferrerPolicyDefault;
 }
 
 } // namespace blink