Convert utility process zip creator IPC to mojo

chrome/browser/chromeos/file_manager/zip_file_creator.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 CHROME_BROWSER_CHROMEOS_FILE_MANAGER_ZIP_FILE_CREATOR_H_
 #define CHROME_BROWSER_CHROMEOS_FILE_MANAGER_ZIP_FILE_CREATOR_H_
 
 #include "base/callback.h"
 #include "base/files/file.h"
 #include "base/files/file_path.h"
-#include "content/public/browser/utility_process_host_client.h"
+#include "base/memory/ref_counted.h"
+#include "chrome/common/zip_file_creator.mojom.h"
+#include "content/public/browser/utility_process_mojo_client.h"
 
 namespace file_manager {
 
 // ZipFileCreator creates a ZIP file from a specified list of files and
 // directories under a common parent directory. This is done in a sandboxed
-// subprocess to protect the browser process from handling arbitrary input data
-// from untrusted sources.
-//
-// The class is ref-counted and its ownership is passed around internal callback
-// objects and finally to UtilityProcessHost. After the job finishes, the host
-// releases the ref-pointer and then ZipFileCreator is automatically deleted.
-class ZipFileCreator : public content::UtilityProcessHostClient {
+// utility process to protect the browser process from handling arbitrary
+// input data from untrusted sources.
+class ZipFileCreator : public base::RefCountedThreadSafe<ZipFileCreator> {
  public:
   typedef base::Callback<void(bool)> ResultCallback;
 
   // Creates a zip file from the specified list of files and directories.
   ZipFileCreator(const ResultCallback& callback,
                  const base::FilePath& src_dir,
                  const std::vector<base::FilePath>& src_relative_paths,
                  const base::FilePath& dest_file);
 
   // Starts creating the zip file. Must be called from the UI thread.
-  // The result will be passed to |callback|. After the task is finished and
-  // |callback| is run, ZipFileCreator instance is deleted.
+  // The result will be passed to |callback|. After the task is finished
+  // and |callback| is run, ZipFileCreator instance is deleted.
   void Start();
 
  private:
-  friend class ProcessHostClient;
+  friend class base::RefCountedThreadSafe<ZipFileCreator>;
 
-  ~ZipFileCreator() override;
+  ~ZipFileCreator();
 
-  // Called after the file handle is opened on blocking pool.
-  void OnOpenFileHandle(base::File file);
-
-  // Starts the utility process that creates the zip file.
-  void StartProcessOnIOThread(base::File dest_file);
-
-  // UtilityProcessHostClient
-  bool OnMessageReceived(const IPC::Message& message) override;
-  void OnProcessCrashed(int exit_code) override;
-
-  // IPC message handlers.
-  void OnCreateZipFileSucceeded();
-  void OnCreateZipFileFailed();
+  // Called after the dest_file |file| is opened on the blocking pool to
+  // create the zip file in it using a sandboxed utility process.
+  void CreateZipFile(base::File file);
 
   void ReportDone(bool success);
 
   // The callback.
   ResultCallback callback_;
 
   // The source directory for input files.
   base::FilePath src_dir_;
 
   // The list of source files paths to be included in the zip file.
   // Entries are relative paths under directory |src_dir_|.
   std::vector<base::FilePath> src_relative_paths_;
 
   // The output zip file.
   base::FilePath dest_file_;
+
+  // Utility process used to create the zip file.
+  std::unique_ptr<
+      content::UtilityProcessMojoClient<chrome::mojom::ZipFileCreator>>
+      utility_process_mojo_client_;
 };
 
 }  // namespace file_manager
 
 #endif  // CHROME_BROWSER_CHROMEOS_FILE_MANAGER_ZIP_FILE_CREATOR_H_