auto import from //depot/cupcake/@135843
diff --git a/include/utils/Timers.h b/include/utils/Timers.h
new file mode 100644
index 0000000..9610399
--- /dev/null
+++ b/include/utils/Timers.h
@@ -0,0 +1,137 @@
+/*
+ * Copyright (C) 2005 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+//
+// Timer functions.
+//
+#ifndef _LIBS_UTILS_TIMERS_H
+#define _LIBS_UTILS_TIMERS_H
+
+#include <stdint.h>
+#include <sys/types.h>
+#include <sys/time.h>
+
+// ------------------------------------------------------------------
+// C API
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef int64_t nsecs_t; // nano-seconds
+
+static inline nsecs_t seconds_to_nanoseconds(nsecs_t secs)
+{
+ return secs*1000000000;
+}
+
+static inline nsecs_t milliseconds_to_nanoseconds(nsecs_t secs)
+{
+ return secs*1000000;
+}
+
+static inline nsecs_t microseconds_to_nanoseconds(nsecs_t secs)
+{
+ return secs*1000;
+}
+
+static inline nsecs_t nanoseconds_to_seconds(nsecs_t secs)
+{
+ return secs/1000000000;
+}
+
+static inline nsecs_t nanoseconds_to_milliseconds(nsecs_t secs)
+{
+ return secs/1000000;
+}
+
+static inline nsecs_t nanoseconds_to_microseconds(nsecs_t secs)
+{
+ return secs/1000;
+}
+
+static inline nsecs_t s2ns(nsecs_t v) {return seconds_to_nanoseconds(v);}
+static inline nsecs_t ms2ns(nsecs_t v) {return milliseconds_to_nanoseconds(v);}
+static inline nsecs_t us2ns(nsecs_t v) {return microseconds_to_nanoseconds(v);}
+static inline nsecs_t ns2s(nsecs_t v) {return nanoseconds_to_seconds(v);}
+static inline nsecs_t ns2ms(nsecs_t v) {return nanoseconds_to_milliseconds(v);}
+static inline nsecs_t ns2us(nsecs_t v) {return nanoseconds_to_microseconds(v);}
+
+static inline nsecs_t seconds(nsecs_t v) { return s2ns(v); }
+static inline nsecs_t milliseconds(nsecs_t v) { return ms2ns(v); }
+static inline nsecs_t microseconds(nsecs_t v) { return us2ns(v); }
+
+enum {
+ SYSTEM_TIME_REALTIME = 0, // system-wide realtime clock
+ SYSTEM_TIME_MONOTONIC = 1, // monotonic time since unspecified starting point
+ SYSTEM_TIME_PROCESS = 2, // high-resolution per-process clock
+ SYSTEM_TIME_THREAD = 3 // high-resolution per-thread clock
+};
+
+// return the system-time according to the specified clock
+#ifdef __cplusplus
+nsecs_t systemTime(int clock = SYSTEM_TIME_MONOTONIC);
+#else
+nsecs_t systemTime(int clock);
+#endif // def __cplusplus
+
+// return the system-time according to the specified clock
+int sleepForInterval(long interval, struct timeval* pNextTick);
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+// ------------------------------------------------------------------
+// C++ API
+
+#ifdef __cplusplus
+
+namespace android {
+/*
+ * Time the duration of something.
+ *
+ * Includes some timeval manipulation functions.
+ */
+class DurationTimer {
+public:
+ DurationTimer(void) {}
+ ~DurationTimer(void) {}
+
+ // Start the timer.
+ void start(void);
+ // Stop the timer.
+ void stop(void);
+ // Get the duration in microseconds.
+ long long durationUsecs(void) const;
+
+ // Subtract two timevals. Returns the difference (ptv1-ptv2) in
+ // microseconds.
+ static long long subtractTimevals(const struct timeval* ptv1,
+ const struct timeval* ptv2);
+
+ // Add the specified amount of time to the timeval.
+ static void addToTimeval(struct timeval* ptv, long usec);
+
+private:
+ struct timeval mStartWhen;
+ struct timeval mStopWhen;
+};
+
+}; // android
+#endif // def __cplusplus
+
+#endif // _LIBS_UTILS_TIMERS_H