mandoline sandbox: prewarm libraries before we raise the sandbox.

mojo/runner/desktop/main.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 "base/at_exit.h"
 #include "base/command_line.h"
+#include "base/files/file_path.h"
 #include "mojo/runner/child_process.h"
 #include "mojo/runner/desktop/launcher_process.h"
 #include "mojo/runner/init.h"
+#include "mojo/runner/native_application_support.h"
 #include "mojo/runner/switches.h"
 
 int main(int argc, char** argv) {
   base::AtExitManager at_exit;
   base::CommandLine::Init(argc, argv);
 
   mojo::runner::InitializeLogging();
 
   const base::CommandLine& command_line =
       *base::CommandLine::ForCurrentProcess();
-  if (command_line.HasSwitch(switches::kChildProcess))
-    return mojo::runner::ChildProcessMain();
+  if (command_line.HasSwitch(switches::kChildProcess)) {
+    mojo::shell::NativeApplicationCleanup cleanup =
+        command_line.HasSwitch(switches::kDeleteAfterLoad)
+            ? mojo::shell::NativeApplicationCleanup::DELETE
+            : mojo::shell::NativeApplicationCleanup::DONT_DELETE;
+    base::NativeLibrary app_library = mojo::runner::LoadNativeApplication(
+        command_line.GetSwitchValuePath(switches::kChildProcess), cleanup);
+
+    return mojo::runner::ChildProcessMain(app_library);
+  }
 
   return mojo::runner::LauncherProcessMain(argc, argv);
 }