Add test for multithreaded ActiveVerifier behavior.

base/test/test_suite.cc

Index: base/test/test_suite.cc
diff --git a/base/test/test_suite.cc b/base/test/test_suite.cc
index 82510a20c6b282f9df2ccd804bf1d7a0b4018f38..74bd9ddf7bd5bd238fb4997630c7dc5bdf51370b 100644
--- a/base/test/test_suite.cc
+++ b/base/test/test_suite.cc
@@ -331,7 +331,10 @@ void TestSuite::Initialize() {
     logging::SetLogAssertHandler(UnitTestAssertHandler);
   }
 
-  i18n::InitializeICU();
+  if (!CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kTestDoNotInitializeIcu)) {
+    i18n::InitializeICU();
+  }
   // On the Mac OS X command line, the default locale is *_POSIX. In Chromium,
   // the locale is set via an OS X locale API and is never *_POSIX.
   // Some tests (such as those involving word break iterator) will behave