Revert of Move BenchTimer to tools as Timer

bench/BenchSysTimer_posix.cpp

Index: bench/BenchSysTimer_posix.cpp
diff --git a/bench/BenchSysTimer_posix.cpp b/bench/BenchSysTimer_posix.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..e6767e5af2267c0c83df90ee39c0f3496fac09ff
--- /dev/null
+++ b/bench/BenchSysTimer_posix.cpp
@@ -0,0 +1,57 @@
+
+/*
+ * 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_posix.h"
+
+//Time
+#include <time.h>
+
+static double intervalInMSec(const timespec start_clock
+                           , const timespec end_clock)
+{
+    double duration_clock;
+    if ((end_clock.tv_nsec - start_clock.tv_nsec) < 0) {
+        duration_clock = (end_clock.tv_sec - start_clock.tv_sec-1)*1000;
+        duration_clock += (1000000000 + end_clock.tv_nsec - start_clock.tv_nsec)
+                           / 1000000.0;
+    } else {
+        duration_clock = (end_clock.tv_sec - start_clock.tv_sec)*1000;
+        duration_clock += (end_clock.tv_nsec - start_clock.tv_nsec) / 1000000.0;
+    }
+    return duration_clock;
+}
+
+void BenchSysTimer::startWall() {
+    if (-1 == clock_gettime(CLOCK_MONOTONIC, &this->fWall)) {
+        timespec none = {0, 0};
+        this->fWall = none;
+    }
+}
+void BenchSysTimer::startCpu() {
+    if (-1 == clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &this->fCpu)) {
+        timespec none = {0, 0};
+        this->fCpu = none;
+    }
+}
+
+double BenchSysTimer::endCpu() {
+    timespec end_cpu;
+    if (-1 == clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &end_cpu)) {
+        timespec none = {0, 0};
+        end_cpu = none;
+    }
+    return intervalInMSec(this->fCpu, end_cpu);
+}
+
+double BenchSysTimer::endWall() {
+    timespec end_wall;
+    if (-1 == clock_gettime(CLOCK_MONOTONIC, &end_wall)) {
+        timespec none = {0, 0};
+        end_wall = none;
+    }
+    return intervalInMSec(this->fWall, end_wall);
+}