Update from https://crrev.com/316786

base/metrics/stats_counters.cc

Index: base/metrics/stats_counters.cc
diff --git a/base/metrics/stats_counters.cc b/base/metrics/stats_counters.cc
deleted file mode 100644
index 12416d9f0f5578a5c5f14ba2973b7e1ea95d7dce..0000000000000000000000000000000000000000
--- a/base/metrics/stats_counters.cc
+++ /dev/null
@@ -1,125 +0,0 @@
-// Copyright (c) 2010 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 "base/metrics/stats_counters.h"
-
-namespace base {
-
-StatsCounter::StatsCounter(const std::string& name)
-    : counter_id_(-1) {
-  // We prepend the name with 'c:' to indicate that it is a counter.
-  if (StatsTable::current()) {
-    // TODO(mbelshe): name_ construction is racy and it may corrupt memory for
-    // static.
-    name_ = "c:";
-    name_.append(name);
-  }
-}
-
-StatsCounter::~StatsCounter() {
-}
-
-void StatsCounter::Set(int value) {
-  int* loc = GetPtr();
-  if (loc)
-    *loc = value;
-}
-
-void StatsCounter::Add(int value) {
-  int* loc = GetPtr();
-  if (loc)
-    (*loc) += value;
-}
-
-StatsCounter::StatsCounter()
-    : counter_id_(-1) {
-}
-
-int* StatsCounter::GetPtr() {
-  StatsTable* table = StatsTable::current();
-  if (!table)
-    return NULL;
-
-  // If counter_id_ is -1, then we haven't looked it up yet.
-  if (counter_id_ == -1) {
-    counter_id_ = table->FindCounter(name_);
-    if (table->GetSlot() == 0) {
-      if (!table->RegisterThread(std::string())) {
-        // There is no room for this thread.  This thread
-        // cannot use counters.
-        counter_id_ = 0;
-        return NULL;
-      }
-    }
-  }
-
-  // If counter_id_ is > 0, then we have a valid counter.
-  if (counter_id_ > 0)
-    return table->GetLocation(counter_id_, table->GetSlot());
-
-  // counter_id_ was zero, which means the table is full.
-  return NULL;
-}
-
-
-StatsCounterTimer::StatsCounterTimer(const std::string& name) {
-  // we prepend the name with 't:' to indicate that it is a timer.
-  if (StatsTable::current()) {
-    // TODO(mbelshe): name_ construction is racy and it may corrupt memory for
-    // static.
-    name_ = "t:";
-    name_.append(name);
-  }
-}
-
-StatsCounterTimer::~StatsCounterTimer() {
-}
-
-void StatsCounterTimer::Start() {
-  if (!Enabled())
-    return;
-  start_time_ = TimeTicks::Now();
-  stop_time_ = TimeTicks();
-}
-
-// Stop the timer and record the results.
-void StatsCounterTimer::Stop() {
-  if (!Enabled() || !Running())
-    return;
-  stop_time_ = TimeTicks::Now();
-  Record();
-}
-
-// Returns true if the timer is running.
-bool StatsCounterTimer::Running() {
-  return Enabled() && !start_time_.is_null() && stop_time_.is_null();
-}
-
-// Accept a TimeDelta to increment.
-void StatsCounterTimer::AddTime(TimeDelta time) {
-  Add(static_cast<int>(time.InMilliseconds()));
-}
-
-void StatsCounterTimer::Record() {
-  AddTime(stop_time_ - start_time_);
-}
-
-
-StatsRate::StatsRate(const std::string& name)
-    : StatsCounterTimer(name),
-      counter_(name),
-      largest_add_(std::string(" ").append(name).append("MAX")) {
-}
-
-StatsRate::~StatsRate() {
-}
-
-void StatsRate::Add(int value) {
-  counter_.Increment();
-  StatsCounterTimer::Add(value);
-  if (value > largest_add_.value())
-    largest_add_.Set(value);
-}
-
-}  // namespace base