Add tools for code coverage support in iOS.

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"
@@ skipping 134 matching lines @@
         [NSCharacterSet newlineCharacterSet]];
 
     NSLog(@"Writing contents of %@ to NSLog", path);
     for (NSString* line in lines) {
       NSLog(@"%@", line);
     }
   }
 }
 
 - (void)runTests {
+  coverage_util::SetupIfNecessary();
+
   int exitStatus = g_test_suite->Run();
 
   if ([self shouldRedirectOutputToFile])
     [self writeOutputToNSLog];
 
   // 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(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 {
 
 std::unique_ptr<base::MessagePump> CreateMessagePumpForUIForTests() {
   // A default MessagePump will do quite nicely in tests.
   return std::unique_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