Report page load timing information for child frames.

chrome/browser/page_load_metrics/observers/core_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 "chrome/browser/page_load_metrics/observers/core_page_load_metrics_observer.h"
 
 #include <stddef.h>
 #include <stdint.h>
 #include <memory>
 #include <utility>
@@ skipping 308 matching lines @@
                         timing.document_timing.first_layout.value());
   } else {
     PAGE_LOAD_HISTOGRAM(internal::kBackgroundHistogramFirstLayout,
                         timing.document_timing.first_layout.value());
   }
 }
 
 void CorePageLoadMetricsObserver::OnFirstPaint(
     const page_load_metrics::PageLoadTiming& timing,
     const page_load_metrics::PageLoadExtraInfo& info) {
+  if (!first_paint_.is_null())
+    return;
+
   first_paint_ =
       info.navigation_start + timing.paint_timing.first_paint.value();
   if (WasStartedInForegroundOptionalEventInForeground(
           timing.paint_timing.first_paint, info)) {
     PAGE_LOAD_HISTOGRAM(internal::kHistogramFirstPaint,
                         timing.paint_timing.first_paint.value());
   } else {
     PAGE_LOAD_HISTOGRAM(internal::kBackgroundHistogramFirstPaint,
                         timing.paint_timing.first_paint.value());
   }
@@ skipping 338 matching lines @@
         extra_request_complete_info) {
   if (extra_request_complete_info.was_cached) {
     ++num_cache_resources_;
     cache_bytes_ += extra_request_complete_info.raw_body_bytes;
   } else {
     ++num_network_resources_;
     network_bytes_ += extra_request_complete_info.raw_body_bytes;
   }
 }
 
+void CorePageLoadMetricsObserver::OnSubFrameTimingUpdate(
+    FrameTreeNodeId child_frame_id,
+    base::TimeDelta child_navigation_start_offset,
+    const page_load_metrics::PageLoadTiming& child_timing,
+    const page_load_metrics::PageLoadMetadata& child_metadata,
+    const page_load_metrics::PageLoadExtraInfo& extra_info) {
+  // TODO(bmcquade): factor core FP/FCP logic across all frames into
+  // PageLoadTracker. This is just an initial implementation for demonstration
+  // purposes.
+  if (child_timing.paint_timing.first_paint && first_paint_.is_null()) {
+    base::TimeDelta first_paint_since_main_frame_navigation_start =
+        child_navigation_start_offset +
+        child_timing.paint_timing.first_paint.value();
+    first_paint_ = extra_info.navigation_start +
+                   first_paint_since_main_frame_navigation_start;
+
+    if (WasStartedInForegroundOptionalEventInForeground(
+            first_paint_since_main_frame_navigation_start, extra_info)) {
+      PAGE_LOAD_HISTOGRAM(internal::kHistogramFirstPaint,
+                          first_paint_since_main_frame_navigation_start);
+    }
+  }
+}
+
 void CorePageLoadMetricsObserver::RecordTimingHistograms(
     const page_load_metrics::PageLoadTiming& timing,
     const page_load_metrics::PageLoadExtraInfo& info) {
   // Log time to first foreground / time to first background. Log counts that we
   // started a relevant page load in the foreground / background.
   if (!info.started_in_foreground && info.first_foreground_time) {
     PAGE_LOAD_HISTOGRAM(internal::kHistogramFirstForeground,
                         info.first_foreground_time.value());
   }
 
@@ skipping 152 matching lines @@
   }
 
   // Log the eTLD+1 of sites that did not report first meaningful paint.
   if (timing.paint_timing.first_paint &&
       !timing.paint_timing.first_meaningful_paint) {
     rappor::SampleDomainAndRegistryFromGURL(
         rappor_service,
         internal::kRapporMetricsNameFirstMeaningfulPaintNotRecorded, info.url);
   }
 }