Update from https://crrev.com/315085

base/test/test_support_ios.mm

 // 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.
 
 #import <UIKit/UIKit.h>
 
 #include "base/debug/debugger.h"
 #include "base/logging.h"
 #include "base/mac/scoped_nsautorelease_pool.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/message_loop/message_loop.h"
 #include "base/message_loop/message_pump_default.h"
 #include "base/test/test_suite.h"
+#include "testing/coverage_util_ios.h"
 
 // Springboard will kill any iOS app that fails to check in after launch within
 // a given time. Starting a UIApplication before invoking TestSuite::Run
 // prevents this from happening.
 
 // InitIOSRunHook saves the TestSuite and argc/argv, then invoking
 // RunTestsFromIOSApp calls UIApplicationMain(), providing an application
 // delegate class: ChromeUnitTestDelegate. The delegate implements
 // application:didFinishLaunchingWithOptions: to invoke the TestSuite's Run
 // method.
@@ skipping 134 matching lines @@
   // 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];
 
+  coverage_util::FlushCoverageDataIfNecessary();
+
   exit(exitStatus);
 }
 
 @end
 
 namespace {
 
 scoped_ptr<base::MessagePump> CreateMessagePumpForUIForTests() {
   // A default MessagePump will do quite nicely in tests.
   return scoped_ptr<base::MessagePump>(new base::MessagePumpDefault());
@@ skipping 26 matching lines @@
   if (!ran_hook) {
     ran_hook = true;
     mac::ScopedNSAutoreleasePool pool;
     int exit_status = UIApplicationMain(g_argc, g_argv, nil,
                                         @"ChromeUnitTestDelegate");
     exit(exit_status);
   }
 }
 
 }  // namespace base