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diff --git a/base/test/main_hook_ios.mm b/base/test/main_hook_ios.mm
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+// 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 "base/test/main_hook.h"
+
+#import <UIKit/UIKit.h>
+
+#include "base/debug/debugger.h"
+#include "base/logging.h"
+#include "base/mac/scoped_nsautorelease_pool.h"
+#include "base/memory/scoped_nsobject.h"
+
+// Springboard will kill any iOS app that fails to check in after launch within
+// a given time. These two classes prevent this from happening.
+
+// MainHook saves the chrome main() and calls UIApplicationMain(),
+// providing an application delegate class: ChromeUnitTestDelegate. The delegate
+// listens for UIApplicationDidFinishLaunchingNotification. When the
+// notification is received, it fires main() again to have the real work done.
+
+// Example usage:
+// int main(int argc, char** argv) {
+//   MainHook hook(main, argc, argv);
+//   // Testing code goes here. There should be no code above MainHook. If
+//   // there is, it will be run twice.
+// }
+
+// Since the executable isn't likely to be a real iOS UI, the delegate puts up a
+// window displaying the app name. If a bunch of apps using MainHook are being
+// run in a row, this provides an indication of which one is currently running.
+
+static MainHook::MainType g_main_func = NULL;
+static int g_argc;
+static char** g_argv;
+
+@interface UIApplication (Testing)
+- (void) _terminateWithStatus:(int)status;
+@end
+
+@interface ChromeUnitTestDelegate : NSObject {
+@private
+  scoped_nsobject<UIWindow> window_;
+}
+- (void)runTests;
+@end
+
+@implementation ChromeUnitTestDelegate
+
+- (BOOL)application:(UIApplication *)application
+    didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
+
+  CGRect bounds = [[UIScreen mainScreen] bounds];
+
+  // Yes, this is leaked, it's just to make what's running visible.
+  window_.reset([[UIWindow alloc] initWithFrame:bounds]);
+  [window_ makeKeyAndVisible];
+
+  // Add a label with the app name.
+  UILabel* label = [[[UILabel alloc] initWithFrame:bounds] autorelease];
+  label.text = [[NSProcessInfo processInfo] processName];
+  label.textAlignment = UITextAlignmentCenter;
+  [window_ addSubview:label];
+
+  // Queue up the test run.
+  [self performSelector:@selector(runTests)
+             withObject:nil
+             afterDelay:0.1];
+  return YES;
+}
+
+- (void)runTests {
+  int exitStatus = g_main_func(g_argc, g_argv);
+
+  // If a test app is too fast, it will exit before Instruments has has a
+  // a chance to initialize and no test results will be seen.
+  // TODO(ios): crbug.com/137010 Figure out how much time is actually needed,
+  // and sleep only to make sure that much time has elapsed since launch.
+  [NSThread sleepUntilDate:[NSDate dateWithTimeIntervalSinceNow:2.0]];
+  window_.reset();
+
+  // Use the hidden selector to try and cleanly take down the app (otherwise
+  // things can think the app crashed even on a zero exit status).
+  UIApplication* application = [UIApplication sharedApplication];
+  [application _terminateWithStatus:exitStatus];
+
+  exit(exitStatus);
+}
+
+@end
+
+#pragma mark -
+
+MainHook::MainHook(MainType main_func, int argc, char* argv[]) {
+  static bool ran_hook = false;
+  if (!ran_hook) {
+    ran_hook = true;
+
+    g_main_func = main_func;
+    g_argc = argc;
+    g_argv = argv;
+
+    base::mac::ScopedNSAutoreleasePool pool;
+    int exit_status = UIApplicationMain(argc, argv, nil,
+                                        @"ChromeUnitTestDelegate");
+    exit(exit_status);
+  }
+}