Add support for media attribute on link

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

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * 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.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 27 matching lines @@
 #include "wtf/Vector.h"
 
 namespace blink {
 
 typedef size_t TokenPreloadScannerCheckpoint;
 
 class HTMLParserOptions;
 class HTMLTokenizer;
 class SegmentedString;
 
+struct ViewportDescriptionWrapper {

[sof, 2016/03/18 20:03:42]

Is there some alternative way of exposing this extra optional argument to
scan()? The added argument looks a bit unusual & quirky.

[Yoav Weiss, 2016/03/18 22:02:49]

Any specific suggestions?

+    ViewportDescription description;
+    bool set;
+    ViewportDescriptionWrapper()
+        : set(false)
+    {
+    }
+};
+
 struct CORE_EXPORT CachedDocumentParameters {
     USING_FAST_MALLOC(CachedDocumentParameters);
 public:
     static PassOwnPtr<CachedDocumentParameters> create(Document* document)
     {
         return adoptPtr(new CachedDocumentParameters(document));
     }
 
     bool doHtmlPreloadScanning;
     Length defaultViewportMinWidth;
     bool viewportMetaZeroValuesQuirk;
     bool viewportMetaEnabled;
     ReferrerPolicy referrerPolicy;
 
 private:
     explicit CachedDocumentParameters(Document*);
 };
 
 class TokenPreloadScanner {
     WTF_MAKE_NONCOPYABLE(TokenPreloadScanner); USING_FAST_MALLOC(TokenPreloadScanner);
 public:
     TokenPreloadScanner(const KURL& documentURL, PassOwnPtr<CachedDocumentParameters>, const MediaValuesCached::MediaValuesCachedData&);
     ~TokenPreloadScanner();
 
-    void scan(const HTMLToken&, const SegmentedString&, PreloadRequestStream& requests);
-    void scan(const CompactHTMLToken&, const SegmentedString&, PreloadRequestStream& requests);
+    void scan(const HTMLToken&, const SegmentedString&, PreloadRequestStream& requests, ViewportDescriptionWrapper*);
+    void scan(const CompactHTMLToken&, const SegmentedString&, PreloadRequestStream& requests, ViewportDescriptionWrapper*);
 
     void setPredictedBaseElementURL(const KURL& url) { m_predictedBaseElementURL = url; }
 
     // A TokenPreloadScannerCheckpoint is valid until the next call to rewindTo,
     // at which point all outstanding checkpoints are invalidated.
     TokenPreloadScannerCheckpoint createCheckpoint();
     void rewindTo(TokenPreloadScannerCheckpoint);
 
 private:
     class StartTagScanner;
 
     template <typename Token>
-    inline void scanCommon(const Token&, const SegmentedString&, PreloadRequestStream& requests);
+    inline void scanCommon(const Token&, const SegmentedString&, PreloadRequestStream& requests, ViewportDescriptionWrapper*);
 
     template<typename Token>
     void updatePredictedBaseURL(const Token&);
 
     struct Checkpoint {
         Checkpoint(const KURL& predictedBaseElementURL, bool inStyle, bool isAppCacheEnabled, bool isCSPEnabled, size_t templateCount)
             : predictedBaseElementURL(predictedBaseElementURL)
             , inStyle(inStyle)
             , isAppCacheEnabled(isAppCacheEnabled)
             , isCSPEnabled(isCSPEnabled)
@@ skipping 42 matching lines @@
 public:
     static PassOwnPtr<HTMLPreloadScanner> create(const HTMLParserOptions& options, const KURL& documentURL, PassOwnPtr<CachedDocumentParameters> documentParameters, const MediaValuesCached::MediaValuesCachedData& mediaValuesCachedData)
     {
         return adoptPtr(new HTMLPreloadScanner(options, documentURL, documentParameters, mediaValuesCachedData));
     }
 
 
     ~HTMLPreloadScanner();
 
     void appendToEnd(const SegmentedString&);
-    void scan(ResourcePreloader*, const KURL& documentBaseElementURL);
+    void scan(ResourcePreloader*, const KURL& documentBaseElementURL, ViewportDescriptionWrapper*);
 
 private:
     HTMLPreloadScanner(const HTMLParserOptions&, const KURL& documentURL, PassOwnPtr<CachedDocumentParameters>, const MediaValuesCached::MediaValuesCachedData&);
 
     TokenPreloadScanner m_scanner;
     SegmentedString m_source;
     HTMLToken m_token;
     OwnPtr<HTMLTokenizer> m_tokenizer;
 };
 
 } // namespace blink
 
 #endif