components/page_load_metrics/common/page_load_timing.h

   1 // Copyright 2015 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 COMPONENTS_PAGE_LOAD_METRICS_COMMON_PAGE_LOAD_TIMING_H_
   6 #define COMPONENTS_PAGE_LOAD_METRICS_COMMON_PAGE_LOAD_TIMING_H_
   7
   8 #include "base/time/time.h"
   9
  10 namespace page_load_metrics {
  11
  12 // PageLoadTiming contains timing metrics associated with a page load. Many of
  13 // the metrics here are based on the Navigation Timing spec:
  14 // http://www.w3.org/TR/navigation-timing/.
  15 struct PageLoadTiming {
  16  public:
  17   PageLoadTiming();
  18   ~PageLoadTiming();
  19
  20   bool operator==(const PageLoadTiming& other) const;
  21
  22   bool IsEmpty() const;
  23
  24   // Time that the navigation for the associated page was initiated.
  25   base::Time navigation_start;
  26
  27   // All TimeDeltas are relative to navigation_start
  28
  29   // Time that the first byte of the response is received.
  30   base::TimeDelta response_start;
  31
  32   // Time immediately before the DOMContentLoaded event is fired.
  33   base::TimeDelta dom_content_loaded_event_start;
  34
  35   // Time immediately before the load event is fired.
  36   base::TimeDelta load_event_start;
  37
  38   // Time when the first layout is completed.
  39   base::TimeDelta first_layout;
  40
  41   // If you add additional members, also be sure to update operator==,
  42   // page_load_metrics_messages.h, and IsEmpty().
  43 };
  44
  45 }  // namespace page_load_metrics
  46
  47 #endif  // COMPONENTS_PAGE_LOAD_METRICS_COMMON_PAGE_LOAD_TIMING_H_