Revert "Revert 224496 "Move ui/base/latency_info* to ui/events""

ui/base/latency_info.cc

-// Copyright 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 "ui/base/latency_info.h"
-
-#include <algorithm>
-
-namespace ui {
-
-LatencyInfo::LatencyInfo() {
-}
-
-LatencyInfo::~LatencyInfo() {
-}
-
-void LatencyInfo::MergeWith(const LatencyInfo& other) {
-  for (LatencyMap::const_iterator it = other.latency_components.begin();
-       it != other.latency_components.end();
-       ++it) {
-    AddLatencyNumberWithTimestamp(it->first.first,
-                                  it->first.second,
-                                  it->second.sequence_number,
-                                  it->second.event_time,
-                                  it->second.event_count);
-  }
-}
-
-void LatencyInfo::AddNewLatencyFrom(const LatencyInfo& other) {
-    for (LatencyMap::const_iterator it = other.latency_components.begin();
-         it != other.latency_components.end();
-         ++it) {
-      if (!FindLatency(it->first.first, it->first.second, NULL)) {
-        AddLatencyNumberWithTimestamp(it->first.first,
-                                      it->first.second,
-                                      it->second.sequence_number,
-                                      it->second.event_time,
-                                      it->second.event_count);
-      }
-    }
-}
-
-void LatencyInfo::AddLatencyNumber(LatencyComponentType component,
-                                   int64 id,
-                                   int64 component_sequence_number) {
-  AddLatencyNumberWithTimestamp(component, id, component_sequence_number,
-                                base::TimeTicks::HighResNow(), 1);
-}
-
-void LatencyInfo::AddLatencyNumberWithTimestamp(LatencyComponentType component,
-                                                int64 id,
-                                                int64 component_sequence_number,
-                                                base::TimeTicks time,
-                                                uint32 event_count) {
-  LatencyMap::key_type key = std::make_pair(component, id);
-  LatencyMap::iterator it = latency_components.find(key);
-  if (it == latency_components.end()) {
-    LatencyComponent info = {component_sequence_number, time, event_count};
-    latency_components[key] = info;
-    return;
-  }
-  it->second.sequence_number = std::max(component_sequence_number,
-                                        it->second.sequence_number);
-  uint32 new_count = event_count + it->second.event_count;
-  if (event_count > 0 && new_count != 0) {
-    // Do a weighted average, so that the new event_time is the average of
-    // the times of events currently in this structure with the time passed
-    // into this method.
-    it->second.event_time += (time - it->second.event_time) * event_count /
-        new_count;
-    it->second.event_count = new_count;
-  }
-}
-
-bool LatencyInfo::FindLatency(LatencyComponentType type,
-                              int64 id,
-                              LatencyComponent* output) const {
-  LatencyMap::const_iterator it = latency_components.find(
-      std::make_pair(type, id));
-  if (it == latency_components.end())
-    return false;
-  if (output)
-    *output = it->second;
-  return true;
-}
-
-void LatencyInfo::Clear() {
-  latency_components.clear();
-}
-
-}  // namespace ui