Prerender: Disable prefetch if there's an appcache.

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

Index: third_party/WebKit/Source/core/html/parser/HTMLPreloadScanner.h
diff --git a/third_party/WebKit/Source/core/html/parser/HTMLPreloadScanner.h b/third_party/WebKit/Source/core/html/parser/HTMLPreloadScanner.h
index 8433cb9a4e81c5490c7d1ead5b86c4cc9231d049..f327dc64dce997c9719e361bcba8b37ffb62b524 100644
--- a/third_party/WebKit/Source/core/html/parser/HTMLPreloadScanner.h
+++ b/third_party/WebKit/Source/core/html/parser/HTMLPreloadScanner.h
@@ -70,6 +70,7 @@ struct CORE_EXPORT CachedDocumentParameters {
   Length defaultViewportMinWidth;
   bool viewportMetaZeroValuesQuirk;
   bool viewportMetaEnabled;
+  bool isPrefetchOnly;
   ReferrerPolicy referrerPolicy;
 
  private:
@@ -131,15 +132,18 @@ class TokenPreloadScanner {
     Checkpoint(const KURL& predictedBaseElementURL,
                bool inStyle,
                bool inScript,
+               bool isAppCacheEnabled,
                size_t templateCount)
         : predictedBaseElementURL(predictedBaseElementURL),
           inStyle(inStyle),
           inScript(inScript),
+          isAppCacheEnabled(isAppCacheEnabled),
           templateCount(templateCount) {}
 
     KURL predictedBaseElementURL;
     bool inStyle;
     bool inScript;
+    bool isAppCacheEnabled;
     size_t templateCount;
   };
 
@@ -157,6 +161,7 @@ class TokenPreloadScanner {
   bool m_inStyle;
   bool m_inPicture;
   bool m_inScript;
+  bool m_isAppCacheEnabled;
   PictureData m_pictureData;
   size_t m_templateCount;
   std::unique_ptr<CachedDocumentParameters> m_documentParameters;