Reland: Buffer cross frame paint timing updates.

chrome/common/page_load_metrics/test/page_load_metrics_test_util.cc

+// Copyright 2017 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 "chrome/common/page_load_metrics/test/page_load_metrics_test_util.h"
+
+#include "chrome/common/page_load_metrics/page_load_metrics.mojom.h"
+#include "chrome/common/page_load_metrics/page_load_metrics_util.h"
+
+using page_load_metrics::OptionalMin;
+
+void PopulateRequiredTimingFields(
+    page_load_metrics::mojom::PageLoadTiming* inout_timing) {
+  if (inout_timing->paint_timing->first_meaningful_paint &&
+      !inout_timing->paint_timing->first_contentful_paint) {
+    inout_timing->paint_timing->first_contentful_paint =
+        inout_timing->paint_timing->first_meaningful_paint;
+  }
+  if ((inout_timing->paint_timing->first_text_paint ||
+       inout_timing->paint_timing->first_image_paint ||
+       inout_timing->paint_timing->first_contentful_paint) &&
+      !inout_timing->paint_timing->first_paint) {
+    inout_timing->paint_timing->first_paint =
+        OptionalMin(OptionalMin(inout_timing->paint_timing->first_text_paint,
+                                inout_timing->paint_timing->first_image_paint),
+                    inout_timing->paint_timing->first_contentful_paint);
+  }
+  if (inout_timing->paint_timing->first_paint &&
+      !inout_timing->document_timing->first_layout) {
+    inout_timing->document_timing->first_layout =
+        inout_timing->paint_timing->first_paint;
+  }
+  if (inout_timing->document_timing->load_event_start &&
+      !inout_timing->document_timing->dom_content_loaded_event_start) {
+    inout_timing->document_timing->dom_content_loaded_event_start =
+        inout_timing->document_timing->load_event_start;
+  }
+  if (inout_timing->document_timing->first_layout &&
+      !inout_timing->parse_timing->parse_start) {
+    inout_timing->parse_timing->parse_start =
+        inout_timing->document_timing->first_layout;
+  }
+  if (inout_timing->document_timing->dom_content_loaded_event_start &&
+      !inout_timing->parse_timing->parse_stop) {
+    inout_timing->parse_timing->parse_stop =
+        inout_timing->document_timing->dom_content_loaded_event_start;
+  }
+  if (inout_timing->parse_timing->parse_stop &&
+      !inout_timing->parse_timing->parse_start) {
+    inout_timing->parse_timing->parse_start =
+        inout_timing->parse_timing->parse_stop;
+  }
+  if (inout_timing->parse_timing->parse_start &&
+      !inout_timing->response_start) {
+    inout_timing->response_start = inout_timing->parse_timing->parse_start;
+  }
+  if (inout_timing->parse_timing->parse_start) {
+    if (!inout_timing->parse_timing->parse_blocked_on_script_load_duration)
+      inout_timing->parse_timing->parse_blocked_on_script_load_duration =
+          base::TimeDelta();
+    if (!inout_timing->parse_timing
+             ->parse_blocked_on_script_execution_duration) {
+      inout_timing->parse_timing->parse_blocked_on_script_execution_duration =
+          base::TimeDelta();
+    }
+    if (!inout_timing->parse_timing
+             ->parse_blocked_on_script_load_from_document_write_duration) {
+      inout_timing->parse_timing
+          ->parse_blocked_on_script_load_from_document_write_duration =
+          base::TimeDelta();
+    }
+    if (!inout_timing->parse_timing
+             ->parse_blocked_on_script_execution_from_document_write_duration) {
+      inout_timing->parse_timing
+          ->parse_blocked_on_script_execution_from_document_write_duration =
+          base::TimeDelta();
+    }
+  }
+}