SafeAudioVideoChecker: use UtilityProcessMojoClient

chrome/browser/media_galleries/fileapi/safe_audio_video_checker.cc

 // 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.
 
 #include "chrome/browser/media_galleries/fileapi/safe_audio_video_checker.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/callback.h"
-#include "base/logging.h"
-#include "base/threading/thread_task_runner_handle.h"
 #include "base/time/time.h"
 #include "chrome/grit/generated_resources.h"
 #include "content/public/browser/browser_thread.h"
-#include "content/public/browser/utility_process_host.h"
-#include "services/service_manager/public/cpp/interface_provider.h"
 #include "ui/base/l10n/l10n_util.h"
 
-// TODO(noel): remove state_ once this code is all mojo.
 SafeAudioVideoChecker::SafeAudioVideoChecker(
     base::File file,
     const storage::CopyOrMoveFileValidator::ResultCallback& callback)
-    : state_(INITIAL_STATE), file_(std::move(file)), callback_(callback) {
-  DCHECK(!callback.is_null());
+    : file_(std::move(file)), callback_(callback) {
+  DCHECK(!callback_.is_null());
 }
 
 void SafeAudioVideoChecker::Start() {
   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
-  if (state_ != INITIAL_STATE)
-    return;
-  state_ = STARTED_STATE;
 
   if (!file_.IsValid()) {
     callback_.Run(base::File::FILE_ERROR_SECURITY);
-    state_ = FINISHED_STATE;
     return;
   }
 
-  utility_process_host_ = content::UtilityProcessHost::Create(
-      this, base::ThreadTaskRunnerHandle::Get())->AsWeakPtr();
-  utility_process_host_->SetName(l10n_util::GetStringUTF16(
-      IDS_UTILITY_PROCESS_MEDIA_FILE_CHECKER_NAME));
+  DCHECK(!utility_process_mojo_client_);
 
-  utility_process_host_->Start();
+  const base::string16 utility_process_name =
+      l10n_util::GetStringUTF16(IDS_UTILITY_PROCESS_MEDIA_FILE_CHECKER_NAME);
 
-  utility_process_host_->GetRemoteInterfaces()->GetInterface(&interface_);
-  interface_.set_connection_error_handler(
-      base::Bind(&SafeAudioVideoChecker::OnCheckingFinished, this, false));
+  utility_process_mojo_client_.reset(

[Lei Zhang, 2017/03/11 00:44:19]

nit for future CLs in general: foo_unique_ptr.reset(new Foo(bar)) ->
foo_unique_ptr = base::MakeUnique<Foo>(bar);

+      new content::UtilityProcessMojoClient<extensions::mojom::MediaParser>(
+          utility_process_name));
+  utility_process_mojo_client_->set_error_callback(
+      base::Bind(&SafeAudioVideoChecker::CheckMediaFileDone, this, false));
 
-  constexpr base::TimeDelta kFileDecodeTime =
-      base::TimeDelta::FromMilliseconds(250);
-  interface_->CheckMediaFile(
+  utility_process_mojo_client_->Start();  // Start the utility process.
+
+  constexpr auto kFileDecodeTime = base::TimeDelta::FromMilliseconds(250);
+
+  utility_process_mojo_client_->service()->CheckMediaFile(
       kFileDecodeTime, std::move(file_),
-      base::Bind(&SafeAudioVideoChecker::OnCheckingFinished, this));
+      base::Bind(&SafeAudioVideoChecker::CheckMediaFileDone, this));
 }
 
-SafeAudioVideoChecker::~SafeAudioVideoChecker() {}
+void SafeAudioVideoChecker::CheckMediaFileDone(bool valid) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
 
-void SafeAudioVideoChecker::OnCheckingFinished(bool valid) {
-  DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
-  if (state_ != STARTED_STATE)
-    return;
-  state_ = FINISHED_STATE;
-
-  interface_.reset();
-  callback_.Run(valid ? base::File::FILE_OK :
-                        base::File::FILE_ERROR_SECURITY);
+  utility_process_mojo_client_.reset();  // Terminate the utility process.
+  callback_.Run(valid ? base::File::FILE_OK : base::File::FILE_ERROR_SECURITY);
 }
 
-// TODO(noel): remove, use the utility process mojo host client.
-void SafeAudioVideoChecker::OnProcessCrashed(int exit_code) {
-  OnCheckingFinished(false);
-}
-
-// TODO(noel): remove, use the utility process mojo host client.
-bool SafeAudioVideoChecker::OnMessageReceived(const IPC::Message& message) {
-  return false;
-}
+SafeAudioVideoChecker::~SafeAudioVideoChecker() = default;