Sandbox html_viewer on Linux.

components/html_viewer/html_viewer_main.cc

 // Copyright 2015 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 "components/html_viewer/html_viewer.h"
 #include "mojo/application/public/cpp/application_runner.h"
 #include "third_party/mojo/src/mojo/public/c/system/main.h"
 
+// TODO(erg): Much of this will be the same between mojo applications. Maybe we
+// could centralize this code?
+#if defined(OS_LINUX) && !defined(OS_ANDROID)
+#include "base/rand_util.h"
+#include "base/sys_info.h"
+#include "third_party/icu/source/i18n/unicode/timezone.h"
+
+// TODO(erg): Much of this was coppied from zygote_main_linux.cc
+extern "C" {
+void __attribute__((visibility("default"))) MojoSandboxWarm() {
+  base::RandUint64();
+  base::SysInfo::AmountOfPhysicalMemory();
+  base::SysInfo::MaxSharedMemorySize();
+  base::SysInfo::NumberOfProcessors();
+
+  // ICU DateFormat class (used in base/time_format.cc) needs to get the
+  // Olson timezone ID by accessing the zoneinfo files on disk. After
+  // TimeZone::createDefault is called once here, the timezone ID is
+  // cached and there's no more need to access the file system.
+  scoped_ptr<icu::TimeZone> zone(icu::TimeZone::createDefault());
+
+  // TODO(erg): Perform OpenSSL warmup; it wants access to /dev/urandom.
+}
+}
+#endif  // defined(OS_LINUX) && !defined(OS_ANDROID)
+
 MojoResult MojoMain(MojoHandle shell_handle) {
   mojo::ApplicationRunner runner(new html_viewer::HTMLViewer);
   return runner.Run(shell_handle);
 }