Fail when saving page as MHTML provides information about the cause.

content/browser/download/mhtml_generation_manager.h

 // Copyright (c) 2012 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_BROWSER_DOWNLOAD_MHTML_GENERATION_MANAGER_H_
 #define CONTENT_BROWSER_DOWNLOAD_MHTML_GENERATION_MANAGER_H_
 
 #include <stdint.h>
 
 #include <map>
 #include <memory>
 #include <set>
 #include <string>
 
 #include "base/files/file.h"
 #include "base/macros.h"
 #include "base/memory/singleton.h"
 #include "base/process/process.h"
+#include "content/common/download/mhtml_save_status.h"
 #include "content/public/common/mhtml_generation_params.h"
 #include "ipc/ipc_platform_file.h"
 
 namespace base {
 class FilePath;
 }
 
 namespace content {
 
 class RenderFrameHostImpl;
@@ skipping 18 matching lines @@
   // representation of the current page.
   void SaveMHTML(WebContents* web_contents,
                  const MHTMLGenerationParams& params,
                  const GenerateMHTMLCallback& callback);
 
   // Handler for FrameHostMsg_SerializeAsMHTMLResponse (a notification from the
   // renderer that the MHTML generation finished for a single frame).
   void OnSerializeAsMHTMLResponse(
       RenderFrameHostImpl* sender,
       int job_id,
-      bool mhtml_generation_in_renderer_succeeded,
+      MhtmlSaveStatus save_status,
       const std::set<std::string>& digests_of_uris_of_serialized_resources,
       base::TimeDelta renderer_main_thread_time);
 
  private:
   friend struct base::DefaultSingletonTraits<MHTMLGenerationManager>;
   class Job;
-  enum class JobStatus { SUCCESS, FAILURE };
 
   MHTMLGenerationManager();
   virtual ~MHTMLGenerationManager();
 
   // Called on the file thread to create |file|.
   static base::File CreateFile(const base::FilePath& file_path);
 
   // Called on the UI thread when the file that should hold the MHTML data has
   // been created.
   void OnFileAvailable(int job_id, base::File browser_file);
 
   // Called on the UI thread when a job has been finished.
-  void JobFinished(Job* job, JobStatus job_status);
+  void JobFinished(Job* job, MhtmlSaveStatus save_status);
 
   // Called on the UI thread after the file got finalized and we have its size.
-  void OnFileClosed(int job_id, JobStatus job_status, int64_t file_size);
+  void OnFileClosed(int job_id, MhtmlSaveStatus save_status, int64_t file_size);
 
   // Creates and registers a new job.
   Job* NewJob(WebContents* web_contents,
               const MHTMLGenerationParams& params,
               const GenerateMHTMLCallback& callback);
 
   // Finds job by id.  Returns nullptr if no job with a given id was found.
   Job* FindJob(int job_id);
 
   // Called when the render process connected to a job exits.
   void RenderProcessExited(Job* job);
 
   std::map<int, std::unique_ptr<Job>> id_to_job_;
 
   int next_job_id_;
 
   DISALLOW_COPY_AND_ASSIGN(MHTMLGenerationManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_MHTML_GENERATION_MANAGER_H_