Revert of Move BenchTimer to tools as Timer

bench/BenchSysTimer_mach.cpp

Index: bench/BenchSysTimer_mach.cpp
diff --git a/bench/BenchSysTimer_mach.cpp b/bench/BenchSysTimer_mach.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..1f0a6b98615fc3733ea50a0b7c9357bd876253a4
--- /dev/null
+++ b/bench/BenchSysTimer_mach.cpp
@@ -0,0 +1,76 @@
+
+/*
+ * Copyright 2011 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#include "BenchSysTimer_mach.h"
+
+//Time
+#include <mach/mach.h>
+#include <mach/mach_time.h>
+
+static time_value_t macCpuTime() {
+    mach_port_t task = mach_task_self();
+    if (task == MACH_PORT_NULL) {
+        time_value_t none = {0, 0};
+        return none;
+    }
+
+    task_thread_times_info thread_info_data;
+    mach_msg_type_number_t thread_info_count = TASK_THREAD_TIMES_INFO_COUNT;
+    if (KERN_SUCCESS != task_info(task,
+                 TASK_THREAD_TIMES_INFO,
+                 reinterpret_cast<task_info_t>(&thread_info_data),
+                 &thread_info_count))
+    {
+        time_value_t none = {0, 0};
+        return none;
+    }
+
+    time_value_add(&thread_info_data.user_time, &thread_info_data.system_time)
+    return thread_info_data.user_time;
+}
+
+static double intervalInMSec(const time_value_t start_clock
+                           , const time_value_t end_clock)
+{
+    double duration_clock;
+    if ((end_clock.microseconds - start_clock.microseconds) < 0) {
+        duration_clock = (end_clock.seconds - start_clock.seconds-1)*1000;
+        duration_clock += (1000000
+                           + end_clock.microseconds
+                           - start_clock.microseconds) / 1000.0;
+    } else {
+        duration_clock = (end_clock.seconds - start_clock.seconds)*1000;
+        duration_clock += (end_clock.microseconds - start_clock.microseconds)
+                           / 1000.0;
+    }
+    return duration_clock;
+}
+
+void BenchSysTimer::startWall() {
+    this->fStartWall = mach_absolute_time();
+}
+void BenchSysTimer::startCpu() {
+    this->fStartCpu = macCpuTime();
+}
+
+double BenchSysTimer::endCpu() {
+    time_value_t end_cpu = macCpuTime();
+    return intervalInMSec(this->fStartCpu, end_cpu);
+}
+double BenchSysTimer::endWall() {
+    uint64_t end_wall = mach_absolute_time();
+
+    uint64_t elapsed = end_wall - this->fStartWall;
+    mach_timebase_info_data_t sTimebaseInfo;
+    if (KERN_SUCCESS != mach_timebase_info(&sTimebaseInfo)) {
+        return 0;
+    } else {
+        uint64_t elapsedNano = elapsed * sTimebaseInfo.numer
+                               / sTimebaseInfo.denom;
+        return elapsedNano / 1000000.0;
+    }
+}