Keep only base/extractor.[cc|h].

base/highres_timer-win32.cc

-// Copyright 2006-2009 Google Inc.
-//
-// 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.
-// ========================================================================
-#include "omaha/base/highres_timer-win32.h"
-
-namespace omaha {
-
-bool HighresTimer::perf_freq_collected_ = false;
-ULONGLONG HighresTimer::perf_freq_ = 0;
-
-ULONGLONG HighresTimer::GetElapsedMs() const {
-  ULONGLONG end_time = GetCurrentTicks();
-
-  // Scale to ms and round to nearerst ms - rounding is important
-  // because otherwise the truncation error may accumulate e.g. in sums.
-  //
-  // Given infinite resolution, this expression could be written as:
-  //  trunc((end - start (units:freq*sec))/freq (units:sec) *
-  //                1000 (unit:ms) + 1/2 (unit:ms))
-  ULONGLONG freq = GetTimerFrequency();
-  return ((end_time - start_ticks_) * 1000L + freq / 2) / freq;
-}
-
-ULONGLONG HighresTimer::GetElapsedSec() const {
-  ULONGLONG end_time = GetCurrentTicks();
-
-  // Scale to ms and round to nearerst ms - rounding is important
-  // because otherwise the truncation error may accumulate e.g. in sums.
-  //
-  // Given infinite resolution, this expression could be written as:
-  //  trunc((end - start (units:freq*sec))/freq (unit:sec) + 1/2 (unit:sec))
-  ULONGLONG freq = GetTimerFrequency();
-  return ((end_time - start_ticks_) + freq / 2) / freq;
-}
-
-void HighresTimer::CollectPerfFreq() {
-  LARGE_INTEGER freq;
-
-  // Note that this is racy.
-  // It's OK, however, because even concurrent executions of this
-  // are idempotent.
-  if (::QueryPerformanceFrequency(&freq)) {
-    perf_freq_ = freq.QuadPart;
-    perf_freq_collected_ = true;
-  }
-}
-
-}  // namespace omaha
-