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diff --git a/base/watchdog_test.cc b/base/watchdog_test.cc
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Tests for Watchdog class.
+
+#include "base/logging.h"
+#include "base/watchdog.h"
+#include "base/spin_wait.h"
+#include "base/time.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+//------------------------------------------------------------------------------
+// Provide a derived class to facilitate testing.
+
+// TODO(JAR): Remove default argument from constructor, and make mandatory.
+class WatchdogCounter : public Watchdog {
+ public:
+  WatchdogCounter(const TimeDelta& duration,
+                  const std::wstring& thread_watched_name,
+                  bool enabled = true)
+      : Watchdog(duration, thread_watched_name, enabled), alarm_counter_(0) {
+  }
+
+  virtual ~WatchdogCounter() {}
+
+  virtual void Alarm() {
+    alarm_counter_++;
+    Watchdog::Alarm();
+  }
+
+  int alarm_counter() { return alarm_counter_; }
+
+ private:
+  int alarm_counter_;
+
+  DISALLOW_EVIL_CONSTRUCTORS(WatchdogCounter);
+};
+
+class WatchdogTest : public testing::Test {
+};
+
+
+//------------------------------------------------------------------------------
+// Actual tests
+
+// Minimal constructor/destructor test.
+TEST(WatchdogTest, StartupShutdownTest) {
+  Watchdog watchdog1(TimeDelta::FromMilliseconds(300), L"Disabled", false);
+  Watchdog watchdog2(TimeDelta::FromMilliseconds(300), L"Enabled", true);
+
+  // The following test is depricated, and should be removed when the
+  // default argument constructor is no longer accepted.
+  Watchdog watchdog3(TimeDelta::FromMilliseconds(300), L"Default");
+}
+
+// Test ability to call Arm and Disarm repeatedly.
+TEST(WatchdogTest, ArmDisarmTest) {
+  Watchdog watchdog1(TimeDelta::FromMilliseconds(300), L"Disabled", false);
+  watchdog1.Arm();
+  watchdog1.Disarm();
+  watchdog1.Arm();
+  watchdog1.Disarm();
+
+  Watchdog watchdog2(TimeDelta::FromMilliseconds(300), L"Enabled", true);
+  watchdog2.Arm();
+  watchdog2.Disarm();
+  watchdog2.Arm();
+  watchdog2.Disarm();
+
+  // The following test is depricated, and should be removed when the
+  // default argument constructor is no longer accepted.
+  Watchdog watchdog3(TimeDelta::FromMilliseconds(300), L"Default");
+  watchdog3.Arm();
+  watchdog3.Disarm();
+  watchdog3.Arm();
+  watchdog3.Disarm();
+}
+
+// Make sure a basic alarm fires when the time has expired.
+TEST(WatchdogTest, AlarmTest) {
+  WatchdogCounter watchdog(TimeDelta::FromMilliseconds(10), L"Enabled", true);
+  watchdog.Arm();
+  SPIN_FOR_TIMEDELTA_OR_UNTIL_TRUE(TimeDelta::FromSeconds(1),
+                                   watchdog.alarm_counter() > 0);
+  EXPECT_EQ(1, watchdog.alarm_counter());
+
+  // Set a time greater than the timeout into the past.
+  watchdog.ArmSomeTimeDeltaAgo(TimeDelta::FromSeconds(2));
+  // It should instantly go off, but certainly in less than a second.
+  SPIN_FOR_TIMEDELTA_OR_UNTIL_TRUE(TimeDelta::FromSeconds(1),
+                                   watchdog.alarm_counter() > 1);
+
+  EXPECT_EQ(2, watchdog.alarm_counter());
+}
+
+// Make sure a disable alarm does nothing, even if we arm it.
+TEST(WatchdogTest, ConstructorDisabledTest) {
+  WatchdogCounter watchdog(TimeDelta::FromMilliseconds(10), L"Disabled", false);
+  watchdog.Arm();
+  // Alarm should not fire, as it was disabled.
+  Sleep(500);
+  EXPECT_EQ(0, watchdog.alarm_counter());
+}
+
+// Make sure Disarming will prevent firing, even after Arming.
+TEST(WatchdogTest, DisarmTest) {
+  WatchdogCounter watchdog(TimeDelta::FromSeconds(1), L"Enabled", true);
+  watchdog.Arm();
+  Sleep(100);  // Don't sleep too long
+  watchdog.Disarm();
+  // Alarm should not fire.
+  Sleep(1500);
+  EXPECT_EQ(0, watchdog.alarm_counter());
+
+  // ...but even after disarming, we can still use the alarm...
+  // Set a time greater than the timeout into the past.
+  watchdog.ArmSomeTimeDeltaAgo(TimeDelta::FromSeconds(2));
+  // It should almost instantly go off, but certainly in less than a second.
+  SPIN_FOR_TIMEDELTA_OR_UNTIL_TRUE(TimeDelta::FromSeconds(1),
+                                   watchdog.alarm_counter() > 0);
+
+  EXPECT_EQ(1, watchdog.alarm_counter());
+}
+
+}  // namespace