Introduces a new MHTML generation parameter specifying different behvaior for cache-control headers.

content/public/common/mhtml_generation_params.h

Index: content/public/common/mhtml_generation_params.h
diff --git a/content/public/common/mhtml_generation_params.h b/content/public/common/mhtml_generation_params.h
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+++ b/content/public/common/mhtml_generation_params.h
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+// 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,
+
+  // |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
+};
+
+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_