Remove time ticks metrics and MetricServiceClient::OnLogUploadComplete

chrome/browser/metrics/time_ticks_experiment_win.cc

Index: chrome/browser/metrics/time_ticks_experiment_win.cc
diff --git a/chrome/browser/metrics/time_ticks_experiment_win.cc b/chrome/browser/metrics/time_ticks_experiment_win.cc
deleted file mode 100644
index 3f81ba1fb985594bbb633cd58a0e75f35a5115d8..0000000000000000000000000000000000000000
--- a/chrome/browser/metrics/time_ticks_experiment_win.cc
+++ /dev/null
@@ -1,116 +0,0 @@
-// Copyright (c) 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "chrome/browser/metrics/time_ticks_experiment_win.h"
-
-#if defined(OS_WIN)
-
-#include <windows.h>
-#include <algorithm>
-
-#include "base/cpu.h"
-#include "base/metrics/histogram_macros.h"
-#include "base/win/windows_version.h"
-#include "build/build_config.h"
-
-namespace chrome {
-
-namespace {
-
-const int kNumIterations = 1000;
-
-}  // anonymous namespace
-
-void CollectTimeTicksStats() {
-  // This bit is supposed to indicate that rdtsc is safe across cores. If so, we
-  // can use QPC as long as it uses rdtsc.
-  // TODO(simonjam): We should look for other signals that QPC might be safe and
-  // test them out here.
-  base::CPU cpu;
-  UMA_HISTOGRAM_BOOLEAN("WinTimeTicks.NonStopTsc",
-                        cpu.has_non_stop_time_stamp_counter());
-  if (!cpu.has_non_stop_time_stamp_counter()) {
-    return;
-  }
-
-  DWORD_PTR default_mask;
-  DWORD_PTR system_mask;
-  if (!GetProcessAffinityMask(GetCurrentProcess(),
-                              &default_mask, &system_mask)) {
-    return;
-  }
-  if (!default_mask) {
-    return;
-  }
-
-  DWORD_PTR current_mask = 1;
-  bool failed_to_change_cores = false;
-
-  base::win::OSInfo* info = base::win::OSInfo::GetInstance();
-  UMA_HISTOGRAM_ENUMERATION("WinTimeTicks.VersionTotal", info->version(),
-                            base::win::VERSION_WIN_LAST);
-
-  LARGE_INTEGER qpc_frequency;
-  QueryPerformanceFrequency(&qpc_frequency);
-
-  int min_delta = 1e9;
-  LARGE_INTEGER qpc_last;
-  QueryPerformanceCounter(&qpc_last);
-  for (int i = 0; i < kNumIterations; ++i) {
-    LARGE_INTEGER qpc_now;
-    QueryPerformanceCounter(&qpc_now);
-    int delta = static_cast<int>(qpc_now.QuadPart - qpc_last.QuadPart);
-    if (delta != 0) {
-      min_delta = std::min(min_delta, delta);
-    }
-    qpc_last = qpc_now;
-
-    // Change cores every 10 iterations.
-    if (i % 10 == 0) {
-      DWORD_PTR old_mask = current_mask;
-      current_mask <<= 1;
-      while ((current_mask & default_mask) == 0) {
-        current_mask <<= 1;
-        if (!current_mask) {
-          current_mask = 1;
-        }
-        if (current_mask == old_mask) {
-          break;
-        }
-      }
-      if (!SetThreadAffinityMask(GetCurrentThread(), current_mask)) {
-        failed_to_change_cores = true;
-        break;
-      }
-    }
-  }
-
-  SetThreadAffinityMask(GetCurrentThread(), default_mask);
-  if (failed_to_change_cores) {
-    UMA_HISTOGRAM_ENUMERATION("WinTimeTicks.FailedToChangeCores",
-                              info->version(), base::win::VERSION_WIN_LAST);
-    return;
-  }
-
-  if (min_delta < 0) {
-    UMA_HISTOGRAM_ENUMERATION("WinTimeTicks.TickedBackwards", info->version(),
-                              base::win::VERSION_WIN_LAST);
-    return;
-  }
-
-  int min_delta_ns = static_cast<int>(
-      min_delta * (1e9 / qpc_frequency.QuadPart));
-  UMA_HISTOGRAM_CUSTOM_COUNTS("WinTimeTicks.MinResolutionNanoseconds",
-                              min_delta_ns, 1, 1000000, 50);
-
-  bool success = min_delta_ns <= 10000;
-  if (success) {
-    UMA_HISTOGRAM_ENUMERATION("WinTimeTicks.VersionSuccessful",
-                              info->version(), base::win::VERSION_WIN_LAST);
-  }
-}
-
-}  // namespace chrome
-
-#endif  // defined(OS_WIN)