Add tools for code coverage support in iOS.

base/test/test_support_ios.mm

Index: base/test/test_support_ios.mm
diff --git a/base/test/test_support_ios.mm b/base/test/test_support_ios.mm
index d7e99908eaf857b3240cc22aca57eec0dda5d26b..7e518a007e7140cfde4b8ee3ee47e870650c8502 100644
--- a/base/test/test_support_ios.mm
+++ b/base/test/test_support_ios.mm
@@ -152,6 +152,8 @@ static char** g_argv;
 }
 
 - (void)runTests {
+  coverage_util::SetupIfNecessary();
+
   int exitStatus = g_test_suite->Run();
 
   if ([self shouldRedirectOutputToFile])
@@ -169,8 +171,6 @@ static char** g_argv;
   UIApplication* application = [UIApplication sharedApplication];
   [application _terminateWithStatus:exitStatus];
 
-  coverage_util::FlushCoverageDataIfNecessary();
-
   exit(exitStatus);
 }