Move MHTML file writing out of the renderer main thread.

third_party/WebKit/Source/platform/mhtml/MHTMLArchive.h

 /*
  * Copyright (C) 2011 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 43 matching lines @@
   enum EncodingPolicy { UseDefaultEncoding, UseBinaryEncoding };
 
   // Generates an MHTML header and appends it to |outputBuffer|.
   //
   // Same |boundary| needs to used for all generateMHTMLHeader and
   // generateMHTMLPart and generateMHTMLFooter calls that belong to the same
   // MHTML document (see also rfc1341, section 7.2.1, "boundary" description).
   static void generateMHTMLHeader(const String& boundary,
                                   const String& title,
                                   const String& mimeType,
-                                  SharedBuffer& outputBuffer);
+                                  Vector<char>& outputBuffer);
 
   // Serializes SerializedResource as an MHTML part and appends it in
   // |outputBuffer|.
   //
   // Same |boundary| needs to used for all generateMHTMLHeader and
   // generateMHTMLPart and generateMHTMLFooter calls that belong to the same
   // MHTML document (see also rfc1341, section 7.2.1, "boundary" description).
   //
   // If |contentID| is non-empty, then it will be used as a Content-ID header.
   // See rfc2557 - section 8.3 - "Use of the Content-ID header and CID URLs".
   static void generateMHTMLPart(const String& boundary,
                                 const String& contentID,
                                 EncodingPolicy,
                                 const SerializedResource&,
-                                SharedBuffer& outputBuffer);
+                                Vector<char>& outputBuffer);
 
   // Generates an MHTML footer and appends it to |outputBuffer|.
   //
   // Same |boundary| needs to used for all generateMHTMLHeader and
   // generateMHTMLPart and generateMHTMLFooter calls that belong to the same
   // MHTML document (see also rfc1341, section 7.2.1, "boundary" description).
   static void generateMHTMLFooter(const String& boundary,
-                                  SharedBuffer& outputBuffer);
+                                  Vector<char>& outputBuffer);
 
   typedef HeapHashMap<String, Member<ArchiveResource>> SubArchiveResources;
 
   ArchiveResource* mainResource() { return m_mainResource.get(); }
   ArchiveResource* subresourceForURL(const KURL&) const;
 
   DECLARE_TRACE();
 
  private:
   MHTMLArchive();
 
   void setMainResource(ArchiveResource*);
   void addSubresource(ArchiveResource*);
   static bool canLoadArchive(const KURL&);
 
   Member<ArchiveResource> m_mainResource;
   SubArchiveResources m_subresources;
 };
 
 }  // namespace blink
 
 #endif