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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CONTENT_BROWSER_RENDERER_HOST_EVENT_WITH_LATENCY_INFO_H_
      6 #define CONTENT_BROWSER_RENDERER_HOST_EVENT_WITH_LATENCY_INFO_H_
      7 
      8 #include "ui/events/latency_info.h"
      9 
     10 #include "content/common/input/web_input_event_traits.h"
     11 
     12 namespace blink {
     13 class WebGestureEvent;
     14 class WebMouseEvent;
     15 class WebMouseWheelEvent;
     16 class WebTouchEvent;
     17 }
     18 
     19 namespace content {
     20 
     21 template <typename T>
     22 class EventWithLatencyInfo {
     23  public:
     24   T event;
     25   ui::LatencyInfo latency;
     26 
     27   EventWithLatencyInfo(const T& e, const ui::LatencyInfo& l)
     28       : event(e), latency(l) {}
     29 
     30   EventWithLatencyInfo() {}
     31 
     32   bool CanCoalesceWith(const EventWithLatencyInfo& other)
     33       const WARN_UNUSED_RESULT {
     34     return WebInputEventTraits::CanCoalesce(other.event, event);
     35   }
     36 
     37   void CoalesceWith(const EventWithLatencyInfo& other) {
     38     WebInputEventTraits::Coalesce(other.event, &event);
     39     // When coalescing two input events, we keep the oldest LatencyInfo
     40     // for Telemetry latency test since it will represent the longest
     41     // latency.
     42     if (other.latency.trace_id >= 0 &&
     43         (latency.trace_id < 0 || other.latency.trace_id < latency.trace_id))
     44       latency = other.latency;
     45   }
     46 };
     47 
     48 typedef EventWithLatencyInfo<blink::WebGestureEvent>
     49     GestureEventWithLatencyInfo;
     50 typedef EventWithLatencyInfo<blink::WebMouseWheelEvent>
     51     MouseWheelEventWithLatencyInfo;
     52 typedef EventWithLatencyInfo<blink::WebMouseEvent>
     53     MouseEventWithLatencyInfo;
     54 typedef EventWithLatencyInfo<blink::WebTouchEvent>
     55     TouchEventWithLatencyInfo;
     56 
     57 }  // namespace content
     58 
     59 #endif  // CONTENT_BROWSER_RENDERER_HOST_EVENT_WITH_LATENCY_INFO_H_
     60