Revert of Move LatencyInfo to ui/latency_info

ui/events/latency_info.h

Index: ui/events/latency_info.h
diff --git a/ui/events/latency_info.h b/ui/events/latency_info.h
new file mode 100644
index 0000000000000000000000000000000000000000..22e1ab4ecfea3641a98a9d5c9a9c4f0f99035307
--- /dev/null
+++ b/ui/events/latency_info.h
@@ -0,0 +1,243 @@
+// 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_EVENTS_LATENCY_INFO_H_
+#define UI_EVENTS_LATENCY_INFO_H_
+
+#include <stdint.h>
+
+#include <memory>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "base/containers/small_map.h"
+#include "base/time/time.h"
+#include "base/trace_event/trace_event.h"
+#include "ui/events/events_base_export.h"
+
+#if !defined(OS_IOS)
+#include "ipc/ipc_param_traits.h"  // nogncheck
+#endif
+
+namespace ui {
+
+// When adding new components, or new metrics based on LatencyInfo,
+// please update latency_info.dot.
+enum LatencyComponentType {
+  // ---------------------------BEGIN COMPONENT-------------------------------
+  // BEGIN COMPONENT is when we show the latency begin in chrome://tracing.
+  // Timestamp when the input event is sent from RenderWidgetHost to renderer.
+  INPUT_EVENT_LATENCY_BEGIN_RWH_COMPONENT,
+  // In threaded scrolling, main thread scroll listener update is async to
+  // scroll processing in impl thread. This is the timestamp when we consider
+  // the main thread scroll listener update is begun.
+  LATENCY_BEGIN_SCROLL_LISTENER_UPDATE_MAIN_COMPONENT,
+  // ---------------------------NORMAL COMPONENT-------------------------------
+  // The original timestamp of the touch event which converts to scroll update.
+  INPUT_EVENT_LATENCY_SCROLL_UPDATE_ORIGINAL_COMPONENT,
+  // The original timestamp of the touch event which converts to the *first*
+  // scroll update in a scroll gesture sequence.
+  INPUT_EVENT_LATENCY_FIRST_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,
+  // This is special component indicating there is rendering scheduled for
+  // the event associated with this LatencyInfo on main thread.
+  INPUT_EVENT_LATENCY_RENDERING_SCHEDULED_MAIN_COMPONENT,
+  // This is special component indicating there is rendering scheduled for
+  // the event associated with this LatencyInfo on impl thread.
+  INPUT_EVENT_LATENCY_RENDERING_SCHEDULED_IMPL_COMPONENT,
+  // Timestamp when a scroll update is forwarded to the main thread.
+  INPUT_EVENT_LATENCY_FORWARD_SCROLL_UPDATE_TO_MAIN_COMPONENT,
+  // Timestamp when the event's ack is received by the RWH.
+  INPUT_EVENT_LATENCY_ACK_RWH_COMPONENT,
+  // Frame number when a window snapshot was requested. The snapshot
+  // is taken when the rendering results actually reach the screen.
+  WINDOW_SNAPSHOT_FRAME_NUMBER_COMPONENT,
+  // Timestamp when a tab is requested to be shown.
+  TAB_SHOW_COMPONENT,
+  // Timestamp when the frame is swapped in renderer.
+  INPUT_EVENT_LATENCY_RENDERER_SWAP_COMPONENT,
+  // Timestamp of when the browser process receives a buffer swap notification
+  // from the renderer.
+  INPUT_EVENT_BROWSER_RECEIVED_RENDERER_SWAP_COMPONENT,
+  // Timestamp of when the gpu service began swap buffers, unlike
+  // INPUT_EVENT_LATENCY_TERMINATED_FRAME_SWAP_COMPONENT which measures after.
+  INPUT_EVENT_GPU_SWAP_BUFFER_COMPONENT,
+  // ---------------------------TERMINAL COMPONENT-----------------------------
+  // TERMINAL COMPONENT is when we show the latency end in chrome://tracing.
+  // Timestamp when the mouse event is acked from renderer and it does not
+  // cause any rendering scheduled.
+  INPUT_EVENT_LATENCY_TERMINATED_MOUSE_COMPONENT,
+  // Timestamp when the mouse wheel event is acked from renderer and it does not
+  // cause any rendering scheduled.
+  INPUT_EVENT_LATENCY_TERMINATED_MOUSE_WHEEL_COMPONENT,
+  // Timestamp when the keyboard event is acked from renderer and it does not
+  // cause any rendering scheduled.
+  INPUT_EVENT_LATENCY_TERMINATED_KEYBOARD_COMPONENT,
+  // Timestamp when the touch event is acked from renderer and it does not
+  // cause any rendering schedueld and does not generate any gesture event.
+  INPUT_EVENT_LATENCY_TERMINATED_TOUCH_COMPONENT,
+  // Timestamp when the gesture event is acked from renderer, and it does not
+  // cause any rendering schedueld.
+  INPUT_EVENT_LATENCY_TERMINATED_GESTURE_COMPONENT,
+  // Timestamp when the frame is swapped (i.e. when the rendering caused by
+  // input event actually takes effect).
+  INPUT_EVENT_LATENCY_TERMINATED_FRAME_SWAP_COMPONENT,
+  // This component indicates that the input causes a commit to be scheduled
+  // but the commit failed.
+  INPUT_EVENT_LATENCY_TERMINATED_COMMIT_FAILED_COMPONENT,
+  // This component indicates that the input causes a commit to be scheduled
+  // but the commit was aborted since it carried no new information.
+  INPUT_EVENT_LATENCY_TERMINATED_COMMIT_NO_UPDATE_COMPONENT,
+  // This component indicates that the input causes a swap to be scheduled
+  // but the swap failed.
+  INPUT_EVENT_LATENCY_TERMINATED_SWAP_FAILED_COMPONENT,
+  LATENCY_COMPONENT_TYPE_LAST =
+    INPUT_EVENT_LATENCY_TERMINATED_SWAP_FAILED_COMPONENT,
+};
+
+class EVENTS_BASE_EXPORT LatencyInfo {
+ public:
+  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_t sequence_number;
+    // Average time of events that happened in this component.
+    base::TimeTicks event_time;
+    // Count of events that happened in this component
+    uint32_t event_count;
+  };
+
+  struct EVENTS_BASE_EXPORT InputCoordinate {
+    InputCoordinate();
+    InputCoordinate(float x, float y);
+
+    float x;
+    float y;
+  };
+
+  // Empirically determined constant based on a typical scroll sequence.
+  enum { kTypicalMaxComponentsPerLatencyInfo = 10 };
+
+  enum { kMaxInputCoordinates = 2 };
+
+  // Map a Latency Component (with a component-specific int64_t id) to a
+  // component info.
+  typedef base::SmallMap<
+      std::map<std::pair<LatencyComponentType, int64_t>, LatencyComponent>,
+      kTypicalMaxComponentsPerLatencyInfo> LatencyMap;
+
+  LatencyInfo();
+  LatencyInfo(const LatencyInfo& other);
+  ~LatencyInfo();
+
+  // For test only.
+  LatencyInfo(int64_t trace_id, bool terminated);
+
+  // Returns true if the vector |latency_info| is valid. Returns false
+  // if it is not valid and log the |referring_msg|.
+  // This function is mainly used to check the latency_info vector that
+  // is passed between processes using IPC message has reasonable size
+  // so that we are confident the IPC message is not corrupted/compromised.
+  // This check will go away once the IPC system has better built-in scheme
+  // for corruption/compromise detection.
+  static bool Verify(const std::vector<LatencyInfo>& latency_info,
+                     const char* referring_msg);
+
+  // Copy LatencyComponents with type |type| from |other| into |this|.
+  void CopyLatencyFrom(const LatencyInfo& other, LatencyComponentType type);
+
+  // 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_t id,
+                        int64_t component_sequence_number);
+
+  // Similar to |AddLatencyNumber|, and also appends |trace_name_str| to
+  // the trace event's name.
+  // This function should only be called when adding a BEGIN component.
+  void AddLatencyNumberWithTraceName(LatencyComponentType component,
+                                     int64_t id,
+                                     int64_t component_sequence_number,
+                                     const char* trace_name_str);
+
+  // Modifies the current sequence number and adds a certain number of events
+  // for a specific component.
+  void AddLatencyNumberWithTimestamp(LatencyComponentType component,
+                                     int64_t id,
+                                     int64_t component_sequence_number,
+                                     base::TimeTicks time,
+                                     uint32_t 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_t id,
+                   LatencyComponent* output) const;
+
+  void RemoveLatency(LatencyComponentType type);
+
+  // Returns true if there is still room for keeping the |input_coordinate|,
+  // false otherwise.
+  bool AddInputCoordinate(const InputCoordinate& input_coordinate);
+
+  uint32_t input_coordinates_size() const { return input_coordinates_size_; }
+  const InputCoordinate* input_coordinates() const {
+    return input_coordinates_;
+  }
+
+  const LatencyMap& latency_components() const { return latency_components_; }
+
+  bool terminated() const { return terminated_; }
+  void set_coalesced() { coalesced_ = true; }
+  bool coalesced() const { return coalesced_; }
+  int64_t trace_id() const { return trace_id_; }
+
+ private:
+  void AddLatencyNumberWithTimestampImpl(LatencyComponentType component,
+                                         int64_t id,
+                                         int64_t component_sequence_number,
+                                         base::TimeTicks time,
+                                         uint32_t event_count,
+                                         const char* trace_name_str);
+
+  // Converts latencyinfo into format that can be dumped into trace buffer.
+  std::unique_ptr<base::trace_event::ConvertableToTraceFormat>
+  AsTraceableData();
+  std::unique_ptr<base::trace_event::ConvertableToTraceFormat>
+  CoordinatesAsTraceableData();
+
+  // Shown as part of the name of the trace event for this LatencyInfo.
+  // String is empty if no tracing is enabled.
+  std::string trace_name_;
+
+  LatencyMap latency_components_;
+
+  // These coordinates represent window coordinates of the original input event.
+  uint32_t input_coordinates_size_;
+  InputCoordinate input_coordinates_[kMaxInputCoordinates];
+
+  // The unique id for matching the ASYNC_BEGIN/END trace event.
+  int64_t trace_id_;
+  // Whether this event has been coalesced into another event.
+  bool coalesced_;
+  // Whether a terminal component has been added.
+  bool terminated_;
+
+#if !defined(OS_IOS)
+  friend struct IPC::ParamTraits<ui::LatencyInfo>;
+#endif
+};
+
+}  // namespace ui
+
+#endif  // UI_EVENTS_LATENCY_INFO_H_