[PageLoadMetrics] Keep track of Ad Sizes on Pages

chrome/browser/page_load_metrics/page_load_tracker.cc

Index: chrome/browser/page_load_metrics/page_load_tracker.cc
diff --git a/chrome/browser/page_load_metrics/page_load_tracker.cc b/chrome/browser/page_load_metrics/page_load_tracker.cc
index 10e75f5f333bc65ed07c4c56204a637b16e7f032..592594c998f5780424e616eeec3bf4d0c8924005 100644
--- a/chrome/browser/page_load_metrics/page_load_tracker.cc
+++ b/chrome/browser/page_load_metrics/page_load_tracker.cc
@@ -463,6 +463,11 @@ void PageLoadTracker::Commit(content::NavigationHandle* navigation_handle) {
   LogAbortChainHistograms(navigation_handle);
 }
 
+void PageLoadTracker::DidCommitSubFrame(
+    content::NavigationHandle* navigation_handle) {
+  INVOKE_AND_PRUNE_OBSERVERS(observers_, OnCommitSubFrame, navigation_handle);
+}
+
 void PageLoadTracker::FailedProvisionalLoad(
     content::NavigationHandle* navigation_handle,
     base::TimeTicks failed_load_time) {