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 151 matching lines @@
   // 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();
+  // TODO(lpromero): Enable.
+  //coverage_util::SetupIfNecessary();

[lpromero, 2017/03/31 11:22:06]

I will re-enable this once I add the "-fprofile-instr-generate" ldflag to all
the targets that depend on test_support_ios.mm. If it's not in this CL, I will
clean this up.

 
   exit(exitStatus);
 }
 
 @end
 
 namespace {
 
 std::unique_ptr<base::MessagePump> CreateMessagePumpForUIForTests() {
   // A default MessagePump will do quite nicely in tests.
@@ skipping 27 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