[Offline Pages] Adding missing image/CSS detection in FrameSerializer.

content/common/frame_messages.h

 // Copyright 2013 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.
 
 // IPC messages for interacting with frames.
 // Multiply-included message file, hence no include guard.
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 493 matching lines @@
   // supported outside of Chrome, so this should not be used if the MHTML is
   // intended for sharing.
   IPC_STRUCT_MEMBER(bool, mhtml_binary_encoding)
 
   IPC_STRUCT_MEMBER(blink::WebFrameSerializerCacheControlPolicy,
                     mhtml_cache_control_policy)
 
   // Whether to remove popup overlay while serializing.
   IPC_STRUCT_MEMBER(bool, mhtml_popup_overlay_removal)
 
+  // Whether to detect problems while serializing.
+  IPC_STRUCT_MEMBER(bool, mhtml_problem_detection)
+
   // Frame to content-id map.
   // Keys are routing ids of either RenderFrames or RenderFrameProxies.
   // Values are MHTML content-ids - see WebFrameSerializer::generateMHTMLParts.
   IPC_STRUCT_MEMBER(FrameMsg_SerializeAsMHTML_FrameRoutingIdToContentIdMap,
                     frame_routing_id_to_content_id)
 
   // |digests_of_uris_to_skip| contains digests of uris of MHTML parts that
   // should be skipped.  This helps deduplicate mhtml parts across frames.
   // SECURITY NOTE: Sha256 digests (rather than uris) are used to prevent
   // disclosing uris to other renderer processes;  the digests should be
@@ skipping 1149 matching lines @@
                     int /* nfr_request_id */,
                     float /* distance */)
 
 IPC_MESSAGE_ROUTED0(FrameHostMsg_NavigationHandledByEmbedder)
 #endif
 
 // Adding a new message? Stick to the sort order above: first platform
 // independent FrameMsg, then ifdefs for platform specific FrameMsg, then
 // platform independent FrameHostMsg, then ifdefs for platform specific
 // FrameHostMsg.