Prototype for improved and generalized immediate event logging.

components/page_load_metrics/browser/page_load_metrics_observer.cc

 // Copyright 2015 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.
 
 #include "components/page_load_metrics/browser/page_load_metrics_observer.h"
 
 namespace page_load_metrics {
 
 PageLoadExtraInfo::PageLoadExtraInfo(base::TimeDelta first_background_time,
                                      base::TimeDelta first_foreground_time,
                                      bool started_in_foreground,
                                      const GURL& committed_url,
                                      base::TimeDelta time_to_commit,
                                      UserAbortType abort_type,
                                      base::TimeDelta time_to_abort,
                                      const PageLoadMetadata& metadata)
     : first_background_time(first_background_time),
       first_foreground_time(first_foreground_time),
       started_in_foreground(started_in_foreground),
       committed_url(committed_url),
       time_to_commit(time_to_commit),
       abort_type(abort_type),
       time_to_abort(time_to_abort),
       metadata(metadata) {}
 
 PageLoadExtraInfo::PageLoadExtraInfo(const PageLoadExtraInfo& other) = default;
 
+void PageLoadMetricsEventObserver::HandleTimingUpdate(
+    const PageLoadTiming& new_timing,
+    const PageLoadExtraInfo& extra_info) {
+  if (!new_timing.dom_content_loaded_event_start.is_zero() &&
+      last_timing_.dom_content_loaded_event_start.is_zero())
+    OnDomContentLoadedEventStart(new_timing, extra_info);
+  if (!new_timing.load_event_start.is_zero() &&
+      last_timing_.load_event_start.is_zero())
+    OnLoadEventStart(new_timing, extra_info);
+  if (!new_timing.first_layout.is_zero() && last_timing_.first_layout.is_zero())
+    OnFirstLayout(new_timing, extra_info);
+  if (!new_timing.first_paint.is_zero() && last_timing_.first_paint.is_zero())
+    OnFirstPaint(new_timing, extra_info);
+  if (!new_timing.first_text_paint.is_zero() &&
+      last_timing_.first_text_paint.is_zero())
+    OnFirstTextPaint(new_timing, extra_info);
+  if (!new_timing.first_image_paint.is_zero() &&
+      last_timing_.first_image_paint.is_zero())
+    OnFirstImagePaint(new_timing, extra_info);
+  if (!new_timing.first_contentful_paint.is_zero() &&
+      last_timing_.first_contentful_paint.is_zero())
+    OnFirstContentfulPaint(new_timing, extra_info);
+  if (!new_timing.parse_start.is_zero() && last_timing_.parse_start.is_zero())
+    OnParseStart(new_timing, extra_info);
+  if (!new_timing.parse_stop.is_zero() && last_timing_.parse_stop.is_zero())
+    OnParseStop(new_timing, extra_info);
+
+  last_timing_ = new_timing;
+}
+
 }  // namespace page_load_metrics