Prototype for improved and generalized immediate event logging.

components/page_load_metrics/browser/page_load_metrics_observer.cc

Index: components/page_load_metrics/browser/page_load_metrics_observer.cc
diff --git a/components/page_load_metrics/browser/page_load_metrics_observer.cc b/components/page_load_metrics/browser/page_load_metrics_observer.cc
index 68de4d49fd291113c88d8f49c790a1a5c4a524db..7d5efc547be88aa1cd6c5c316e18bc836d7b44d7 100644
--- a/components/page_load_metrics/browser/page_load_metrics_observer.cc
+++ b/components/page_load_metrics/browser/page_load_metrics_observer.cc
@@ -25,4 +25,34 @@ PageLoadExtraInfo::PageLoadExtraInfo(base::TimeDelta first_background_time,
 
 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