Adds a feature to MHTML serialization that omits subframes and subresources marked no-store.

content/public/common/mhtml_generation_params.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_PUBLIC_COMMON_MHTML_GENERATION_PARAMS_H_
 #define CONTENT_PUBLIC_COMMON_MHTML_GENERATION_PARAMS_H_
 
 #include "base/files/file_path.h"
 #include "content/common/content_export.h"
 
 namespace content {
 
 // Options for changing serialization behavior based on the CacheControl header
 // of each subresource.
 enum class MHTMLCacheControlPolicy {
   NONE = 0,
   FAIL_FOR_NO_STORE_MAIN_FRAME,
-
+  SKIP_ANY_FRAME_OR_RESOURCE_MARKED_NO_STORE,
   // |LAST| is used in content/public/common/common_param_traits_macros.h with
   // IPC_ENUM_TRAITS_MAX_VALUE macro. Keep the value up to date. Otherwise
   // a new value can not be passed to the renderer.
-  LAST = FAIL_FOR_NO_STORE_MAIN_FRAME
+  LAST = SKIP_ANY_FRAME_OR_RESOURCE_MARKED_NO_STORE
 };
 
 struct CONTENT_EXPORT MHTMLGenerationParams {
   MHTMLGenerationParams(const base::FilePath& file_path);
   ~MHTMLGenerationParams() = default;
 
   // The file that will contain the generated MHTML.
   base::FilePath file_path;
 
   // Uses Content-Transfer-Encoding: binary when encoding.  See
   // https://tools.ietf.org/html/rfc2045 for details about
   // Content-Transfer-Encoding.
   bool use_binary_encoding = false;
 
   // By default, MHTML includes all subresources.  This flag can be used to
   // cause the generator to fail or silently ignore resources if the
   // Cache-Control header is used.
   MHTMLCacheControlPolicy cache_control_policy = MHTMLCacheControlPolicy::NONE;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_MHTML_GENERATION_PARAMS_H_