Use a utility process for the Mojo v8 proxy resolver.

content/browser/utility_process_host_impl.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_impl.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "base/message_loop/message_loop.h"
+#include "base/process/process_handle.h"
 #include "base/run_loop.h"
 #include "base/sequenced_task_runner.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/synchronization/lock.h"
 #include "base/synchronization/waitable_event.h"
 #include "content/browser/browser_child_process_host_impl.h"
+#include "content/browser/mojo/mojo_application_host.h"
 #include "content/browser/renderer_host/render_process_host_impl.h"
 #include "content/common/child_process_host_impl.h"
 #include "content/common/utility_messages.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/browser/utility_process_host_client.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/process_type.h"
 #include "content/public/common/sandboxed_process_launcher_delegate.h"
 #include "ipc/ipc_switches.h"
 #include "ui/base/ui_base_switches.h"
 
 namespace content {
 
 // NOTE: changes to this class need to be reviewed by the security team.
 class UtilitySandboxedProcessLauncherDelegate
     : public SandboxedProcessLauncherDelegate {
  public:
   UtilitySandboxedProcessLauncherDelegate(const base::FilePath& exposed_dir,
-                                          bool launch_elevated, bool no_sandbox,
+                                          bool launch_elevated,
+                                          bool no_sandbox,
                                           const base::EnvironmentMap& env,
                                           ChildProcessHost* host)
       : exposed_dir_(exposed_dir),
 #if defined(OS_WIN)
         launch_elevated_(launch_elevated)
 #elif defined(OS_POSIX)
         env_(env),
         no_sandbox_(no_sandbox),
         ipc_fd_(host->TakeClientFileDescriptor())
 #endif  // OS_WIN
   {}
 
   ~UtilitySandboxedProcessLauncherDelegate() override {}
 
 #if defined(OS_WIN)
-  bool ShouldLaunchElevated() override {
-    return launch_elevated_;
-  }
+  bool ShouldLaunchElevated() override { return launch_elevated_; }
   void PreSandbox(bool* disable_default_policy,
                   base::FilePath* exposed_dir) override {
     *exposed_dir = exposed_dir_;
   }
 #elif defined(OS_POSIX)
 
   bool ShouldUseZygote() override {
     return !no_sandbox_ && exposed_dir_.empty();
   }
   base::EnvironmentMap GetEnvironment() override { return env_; }
@@ skipping 92 matching lines @@
 }
 
 #if defined(OS_POSIX)
 
 void UtilityProcessHostImpl::SetEnv(const base::EnvironmentMap& env) {
   env_ = env;
 }
 
 #endif  // OS_POSIX
 
+bool UtilityProcessHostImpl::StartMojoMode() {
+  CHECK(!mojo_application_host_);
+  mojo_application_host_.reset(new MojoApplicationHost);
+  return StartProcess();
+}
+
+ServiceRegistry* UtilityProcessHostImpl::GetServiceRegistry() {
+  return mojo_application_host_->service_registry();

[Sam McNally, 2015/03/09 03:36:15]

DCHECK(mojo_application_host_);

[Anand Mistry (off Chromium), 2015/03/10 07:24:23]

Done.

+}
+
 bool UtilityProcessHostImpl::StartProcess() {
   if (started_)
     return true;
   started_ = true;
 
   if (is_batch_mode_)
     return true;
 
+  if (mojo_application_host_) {
+    bool mojo_result = mojo_application_host_->Init();

[Sam McNally, 2015/03/09 03:36:15]

Why not do this in StartMojoMode()?

[Anand Mistry (off Chromium), 2015/03/10 07:24:24]

No particular reason.

+    if (!mojo_result)
+      return false;
+  }
+
   // Name must be set or metrics_service will crash in any test which
   // launches a UtilityProcessHost.
   process_.reset(new BrowserChildProcessHostImpl(PROCESS_TYPE_UTILITY, this));
   process_->SetName(base::ASCIIToUTF16("utility process"));
 
   std::string channel_id = process_->GetHost()->CreateChannel();
   if (channel_id.empty())
     return false;
 
   if (RenderProcessHost::run_renderer_in_process()) {
@@ skipping 99 matching lines @@
 void UtilityProcessHostImpl::OnProcessCrashed(int exit_code) {
   if (!client_.get())
     return;
 
   client_task_runner_->PostTask(
       FROM_HERE,
       base::Bind(&UtilityProcessHostClient::OnProcessCrashed, client_.get(),
             exit_code));
 }
 
+void UtilityProcessHostImpl::OnProcessLaunched() {
+  if (mojo_application_host_) {
+    base::ProcessHandle handle;
+    if (RenderProcessHost::run_renderer_in_process())
+      handle = base::GetCurrentProcessHandle();
+    else
+      handle = process_->GetData().handle;
+
+    mojo_application_host_->Activate(this, handle);
+  }
+}
+
 }  // namespace content