Create an API around UtilityProcessHost and use that from chrome.

content/browser/utility_process_host.cc

-// 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.
-
-#include "content/browser/utility_process_host.h"
-
-#include "base/bind.h"
-#include "base/bind_helpers.h"
-#include "base/command_line.h"
-#include "base/message_loop.h"
-#include "base/utf_string_conversions.h"
-#include "content/browser/browser_child_process_host_impl.h"
-#include "content/common/child_process_host_impl.h"
-#include "content/common/utility_messages.h"
-#include "content/public/browser/content_browser_client.h"
-#include "content/public/common/content_switches.h"
-#include "ipc/ipc_switches.h"
-#include "ui/base/ui_base_switches.h"
-#include "webkit/plugins/plugin_switches.h"
-
-using content::BrowserThread;
-using content::ChildProcessHost;
-
-UtilityProcessHost::Client::Client() {
-}
-
-UtilityProcessHost::Client::~Client() {
-}
-
-void UtilityProcessHost::Client::OnProcessCrashed(int exit_code) {
-}
-
-bool UtilityProcessHost::Client::OnMessageReceived(
-    const IPC::Message& message) {
-  return false;
-}
-
-UtilityProcessHost::UtilityProcessHost(Client* client,
-                                       BrowserThread::ID client_thread_id)
-    : client_(client),
-      client_thread_id_(client_thread_id),
-      is_batch_mode_(false),
-      no_sandbox_(false),
-#if defined(OS_LINUX)
-      child_flags_(ChildProcessHost::CHILD_ALLOW_SELF),
-#else
-      child_flags_(ChildProcessHost::CHILD_NORMAL),
-#endif
-      use_linux_zygote_(false),
-      started_(false) {
-  process_.reset(
-      new BrowserChildProcessHostImpl(content::PROCESS_TYPE_UTILITY, this));
-}
-
-UtilityProcessHost::~UtilityProcessHost() {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
-  DCHECK(!is_batch_mode_);
-}
-
-bool UtilityProcessHost::Send(IPC::Message* message) {
-  if (!StartProcess())
-    return false;
-
-  return process_->Send(message);
-}
-
-bool UtilityProcessHost::StartBatchMode()  {
-  CHECK(!is_batch_mode_);
-  is_batch_mode_ = StartProcess();
-  Send(new UtilityMsg_BatchMode_Started());
-  return is_batch_mode_;
-}
-
-void UtilityProcessHost::EndBatchMode()  {
-  CHECK(is_batch_mode_);
-  is_batch_mode_ = false;
-  Send(new UtilityMsg_BatchMode_Finished());
-}
-
-FilePath UtilityProcessHost::GetUtilityProcessCmd() {
-  return ChildProcessHost::GetChildPath(child_flags_);
-}
-
-bool UtilityProcessHost::StartProcess() {
-  if (started_)
-    return true;
-  started_ = true;
-
-  if (is_batch_mode_)
-    return true;
-  // Name must be set or metrics_service will crash in any test which
-  // launches a UtilityProcessHost.
-  process_->SetName(ASCIIToUTF16("utility process"));
-
-  std::string channel_id = process_->GetHost()->CreateChannel();
-  if (channel_id.empty())
-    return false;
-
-  FilePath exe_path = GetUtilityProcessCmd();
-  if (exe_path.empty()) {
-    NOTREACHED() << "Unable to get utility process binary name.";
-    return false;
-  }
-
-  CommandLine* cmd_line = new CommandLine(exe_path);
-  cmd_line->AppendSwitchASCII(switches::kProcessType,
-                              switches::kUtilityProcess);
-  cmd_line->AppendSwitchASCII(switches::kProcessChannelID, channel_id);
-  std::string locale =
-      content::GetContentClient()->browser()->GetApplicationLocale();
-  cmd_line->AppendSwitchASCII(switches::kLang, locale);
-
-  const CommandLine& browser_command_line = *CommandLine::ForCurrentProcess();
-  if (browser_command_line.HasSwitch(switches::kChromeFrame))
-    cmd_line->AppendSwitch(switches::kChromeFrame);
-  if (no_sandbox_ || browser_command_line.HasSwitch(switches::kNoSandbox))
-    cmd_line->AppendSwitch(switches::kNoSandbox);
-  if (browser_command_line.HasSwitch(switches::kDebugPluginLoading))
-    cmd_line->AppendSwitch(switches::kDebugPluginLoading);
-
-#if defined(OS_POSIX)
-  // TODO(port): Sandbox this on Linux.  Also, zygote this to work with
-  // Linux updating.
-  bool has_cmd_prefix = browser_command_line.HasSwitch(
-      switches::kUtilityCmdPrefix);
-  if (has_cmd_prefix) {
-    // launch the utility child process with some prefix (usually "xterm -e gdb
-    // --args").
-    cmd_line->PrependWrapper(browser_command_line.GetSwitchValueNative(
-        switches::kUtilityCmdPrefix));
-  }
-
-  cmd_line->AppendSwitchPath(switches::kUtilityProcessAllowedDir, exposed_dir_);
-#endif
-
-  bool use_zygote = false;
-
-#if defined(OS_LINUX)
-  use_zygote = !no_sandbox_ && use_linux_zygote_;
-#endif
-
-  process_->Launch(
-#if defined(OS_WIN)
-      exposed_dir_,
-#elif defined(OS_POSIX)
-      use_zygote,
-      env_,
-#endif
-      cmd_line);
-
-  return true;
-}
-
-bool UtilityProcessHost::OnMessageReceived(const IPC::Message& message) {
-  BrowserThread::PostTask(
-      client_thread_id_, FROM_HERE,
-      base::Bind(base::IgnoreResult(&Client::OnMessageReceived),
-                 client_.get(), message));
-  return true;
-}
-
-void UtilityProcessHost::OnProcessCrashed(int exit_code) {
-  BrowserThread::PostTask(
-      client_thread_id_, FROM_HERE,
-      base::Bind(&Client::OnProcessCrashed, client_.get(), exit_code));
-}