PlzNavigate: make MHTML iframe load working.

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 20 matching lines @@
 #ifndef MHTMLArchive_h
 #define MHTMLArchive_h
 
 #include "platform/heap/Handle.h"
 #include "platform/wtf/HashMap.h"
 #include "platform/wtf/Vector.h"
 #include "platform/wtf/text/StringHash.h"
 
 namespace blink {
 
+// When URIs use the "cid" (Content-ID) scheme, the resource refers to a
+// specific body part in an MHTML multipart/related structure.
+// See RFC n°2557, section-8.3: "Use of the Content-ID header and CID URLs".
+const char kContentIdScheme[] = "cid";
+
 class ArchiveResource;
 class KURL;
 class SharedBuffer;
 
 struct SerializedResource;
 
 class PLATFORM_EXPORT MHTMLArchive final
     : public GarbageCollected<MHTMLArchive> {
  public:
   static MHTMLArchive* Create(const KURL&, PassRefPtr<const SharedBuffer>);
@@ skipping 50 matching lines @@
   void AddSubresource(ArchiveResource*);
   static bool CanLoadArchive(const KURL&);
 
   Member<ArchiveResource> main_resource_;
   SubArchiveResources subresources_;
 };
 
 }  // namespace blink
 
 #endif