Moving LatencyInfo into a separate component.

ui/events/mojo/latency_info.mojom

-// Copyright 2016 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.
-
-module ui.mojom;
-
-import "mojo/common/time.mojom";
-import "ui/gfx/geometry/mojo/geometry.mojom";
-
-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,
-  // Timestamp when the event is dispatched on the main thread of the renderer.
-  INPUT_EVENT_LATENCY_RENDERER_MAIN_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,
-  // Timestamp of when the gesture scroll update is generated from a mouse wheel
-  // event.
-  INPUT_EVENT_LATENCY_GENERATE_SCROLL_UPDATE_FROM_MOUSE_WHEEL,
-  // ---------------------------TERMINAL COMPONENT-----------------------------
-  // TERMINAL COMPONENT is when we show the latency end in chrome://tracing.
-  // Timestamp when the event is acked from renderer when it does not
-  // cause any rendering to be scheduled.
-  INPUT_EVENT_LATENCY_TERMINATED_NO_SWAP_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,
-};
-
-struct LatencyComponentId {
-  LatencyComponentType type;
-  int64 id;
-};
-
-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.
-  mojo.common.mojom.TimeTicks event_time;
-  // Count of events that happened in this component
-  uint32 event_count;
-  // Time of the oldest event that happened in this component.
-  mojo.common.mojom.TimeTicks first_event_time;
-  // Time of the most recent event that happened in this component.
-  mojo.common.mojom.TimeTicks last_event_time;
-};
-
-struct LatencyComponentPair {
-  LatencyComponentId key;
-  LatencyComponent value;
-};
-
-// See ui/events/latency_info.h
-struct LatencyInfo {
-  string trace_name;
-  array<LatencyComponentPair> latency_components;
-  array<gfx.mojom.PointF> input_coordinates;
-  int64 trace_id;
-  bool coalesced;
-  bool terminated;
-};