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

ui/base/latency_info.h

-// 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.
-
-#ifndef UI_BASE_LATENCY_INFO_H_
-#define UI_BASE_LATENCY_INFO_H_
-
-#include <map>
-#include <utility>
-
-#include "base/basictypes.h"
-#include "base/time/time.h"
-#include "ui/base/ui_export.h"
-
-namespace ui {
-
-enum LatencyComponentType {
-  // Timestamp when the input event is sent from RenderWidgetHost to renderer.
-  INPUT_EVENT_LATENCY_RWH_COMPONENT,
-  // Timestamp when the scroll update gesture event is sent from RWH to
-  // renderer. In Aura, touch event's LatencyInfo is carried over to the gesture
-  // event. So gesture event's INPUT_EVENT_LATENCY_RWH_COMPONENT is the
-  // timestamp when its original touch events is sent from RWH to renderer.
-  // In non-aura platform, INPUT_EVENT_LATENCY_SCROLL_UPDATE_RWH_COMPONENT
-  // is the same as INPUT_EVENT_LATENCY_RWH_COMPONENT.
-  INPUT_EVENT_LATENCY_SCROLL_UPDATE_RWH_COMPONENT,
-  // The original timestamp of the touch event which converts to scroll update.
-  INPUT_EVENT_LATENCY_SCROLL_UPDATE_ORIGINAL_COMPONENT,
-  // Original timestamp for input event (e.g. timestamp from kernel).
-  INPUT_EVENT_LATENCY_ORIGINAL_COMPONENT,
-  // Timestamp when the UI event is created.
-  INPUT_EVENT_LATENCY_UI_COMPONENT,
-  // Timestamp when the event is acked from renderer. This is currently set
-  // only for touch events.
-  INPUT_EVENT_LATENCY_ACKED_COMPONENT
-};
-
-struct UI_EXPORT LatencyInfo {
-  struct LatencyComponent {
-    // Nondecreasing number that can be used to determine what events happened
-    // in the component at the time this struct was sent on to the next
-    // component.
-    int64 sequence_number;
-    // Average time of events that happened in this component.
-    base::TimeTicks event_time;
-    // Count of events that happened in this component
-    uint32 event_count;
-  };
-
-  // Map a Latency Component (with a component-specific int64 id) to a
-  // component info.
-  typedef std::map<std::pair<LatencyComponentType, int64>, LatencyComponent>
-      LatencyMap;
-
-  LatencyInfo();
-
-  ~LatencyInfo();
-
-  // Merges the contents of another LatencyInfo into this one.
-  void MergeWith(const LatencyInfo& other);
-
-  // Add LatencyComponents that are in |other| but not in |this|.
-  void AddNewLatencyFrom(const LatencyInfo& other);
-
-  // Modifies the current sequence number for a component, and adds a new
-  // sequence number with the current timestamp.
-  void AddLatencyNumber(LatencyComponentType component,
-                        int64 id,
-                        int64 component_sequence_number);
-
-  // Modifies the current sequence number and adds a certain number of events
-  // for a specific component.
-  void AddLatencyNumberWithTimestamp(LatencyComponentType component,
-                                     int64 id,
-                                     int64 component_sequence_number,
-                                     base::TimeTicks time,
-                                     uint32 event_count);
-
-  // Returns true if the a component with |type| and |id| is found in
-  // the latency_components and the component is stored to |output| if
-  // |output| is not NULL. Returns false if no such component is found.
-  bool FindLatency(LatencyComponentType type,
-                   int64 id,
-                   LatencyComponent* output) const;
-
-  void Clear();
-
-  LatencyMap latency_components;
-
-  // This represents the final time that a frame is displayed it.
-  base::TimeTicks swap_timestamp;
-};
-
-}  // namespace ui
-
-#endif  // UI_BASE_LATENCY_INFO_H_