Add NSLogTestEventListener to support running tests on iOS 6 devices.

base/test/nslog_test_event_listener.h

Index: base/test/nslog_test_event_listener.h
diff --git a/base/test/nslog_test_event_listener.h b/base/test/nslog_test_event_listener.h
new file mode 100644
index 0000000000000000000000000000000000000000..91411f04c594f2564d5896f09ed8af73f31b62c1
--- /dev/null
+++ b/base/test/nslog_test_event_listener.h
@@ -0,0 +1,48 @@
+// Copyright 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.
+
+#ifndef BASE_TEST_NSLOG_TEST_EVENT_LISTENER_H_
+#define BASE_TEST_NSLOG_TEST_EVENT_LISTENER_H_
+
+#include "base/compiler_specific.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+@class NSString;
+
+// This class implements the TestEventListener interface so that output is
+// formatted like the PrettyUnitTestResultPrinter in gtest.cc, but writes to
+// NSLog instead of stdout (because, as of iOS 6, the app's stdout no longer
+// writes to the console log).
+class NSLogTestEventListener : public testing::TestEventListener {
+ public:
+  NSLogTestEventListener();
+
+  // TestEventListener overrides.
+  virtual void OnTestProgramStart(const testing::UnitTest&) OVERRIDE;
+  virtual void OnTestIterationStart(
+      const testing::UnitTest& unit_test,
+      int iteration) OVERRIDE;
+  virtual void OnEnvironmentsSetUpStart(
+      const testing::UnitTest& unit_test) OVERRIDE;
+  virtual void OnEnvironmentsSetUpEnd(const testing::UnitTest&) OVERRIDE;
+  virtual void OnTestCaseStart(const testing::TestCase& test_case) OVERRIDE;
+  virtual void OnTestStart(const testing::TestInfo& test_info) OVERRIDE;
+  virtual void OnTestPartResult(const testing::TestPartResult& result) OVERRIDE;
+  virtual void OnTestEnd(const testing::TestInfo& test_info) OVERRIDE;
+  virtual void OnTestCaseEnd(const testing::TestCase& test_case) OVERRIDE;
+  virtual void OnEnvironmentsTearDownStart(
+      const testing::UnitTest& unit_test) OVERRIDE;
+  virtual void OnEnvironmentsTearDownEnd(const testing::UnitTest&) OVERRIDE;
+  virtual void OnTestIterationEnd(
+      const testing::UnitTest& unit_test,
+      int iteration) OVERRIDE;
+  virtual void OnTestProgramEnd(const testing::UnitTest&) OVERRIDE;
+
+ private:
+  static NSString* PrintFailedTests(const testing::UnitTest& unit_test);
+  static NSString* PrintFullTestCommentIfPresent(
+      const testing::TestInfo& test_info);
+};
+
+#endif  // BASE_TEST_NSLOG_TEST_EVENT_LISTENER_H_