Move BenchTimer to tools as Timer

tools/timer/SysTimer_posix.cpp

-
 /*
  * 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"
+#include "SysTimer_posix.h"
 
-//Time
-#include <time.h>
-
-static double intervalInMSec(const timespec start_clock
-                           , const timespec end_clock)
+static double interval_in_ms(timespec start_clock, 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;
+        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_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)) {
+void SysTimer::startWall() {
+    if (-1 == clock_gettime(CLOCK_MONOTONIC, &fWall)) {
         timespec none = {0, 0};
-        this->fWall = none;
+        fWall = none;
     }
 }
-void BenchSysTimer::startCpu() {
-    if (-1 == clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &this->fCpu)) {
+void SysTimer::startCpu() {
+    if (-1 == clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &fCpu)) {
         timespec none = {0, 0};
-        this->fCpu = none;
+        fCpu = none;
     }
 }
 
-double BenchSysTimer::endCpu() {
+double SysTimer::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);
+    return interval_in_ms(fCpu, end_cpu);
 }
 
-double BenchSysTimer::endWall() {
+double SysTimer::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);
+    return interval_in_ms(fWall, end_wall);
 }