Prefetch @import files from CSS files.

Source/core/html/parser/CSSPreloadScanner.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 @@
 class CSSPreloadScanner {
     WTF_MAKE_NONCOPYABLE(CSSPreloadScanner);
 public:
     CSSPreloadScanner();
     ~CSSPreloadScanner();
 
     void reset();
 
     void scan(const HTMLToken::DataVector&, const SegmentedString&, PreloadRequestStream&);
     void scan(const String&, const SegmentedString&, PreloadRequestStream&);
+    bool isDoneParsing() { return m_state == DoneParsingImportRules; }

[eseidel, 2014/05/20 07:10:37]

It's probably better to call this isDoneParsingImports, or something so that
callers can have an understanding of when this state is reached.  We wouldn't
want this to get re-used for something else if the CSSPreloadScanner is taught
how to handle more ypes.

 
 private:
     enum State {
         Initial,
         MaybeComment,
         Comment,
         MaybeCommentEnd,
         RuleStart,
         Rule,
         AfterRule,
@@ skipping 12 matching lines @@
     StringBuilder m_rule;
     StringBuilder m_ruleValue;
 
     // Only non-zero during scan()
     PreloadRequestStream* m_requests;
 };
 
 }
 
 #endif