Use FrameIsAd to decide whether to isolate a frame in TopDocumentIsolation mode.

chrome/browser/page_load_metrics/observers/ads_page_load_metrics_observer.cc

Index: chrome/browser/page_load_metrics/observers/ads_page_load_metrics_observer.cc
diff --git a/chrome/browser/page_load_metrics/observers/ads_page_load_metrics_observer.cc b/chrome/browser/page_load_metrics/observers/ads_page_load_metrics_observer.cc
index 659f1fc8db2431233e50e2b035d890cd43710e1a..f52aad87430134eda65d5252cb02f6b9693cdcb1 100644
--- a/chrome/browser/page_load_metrics/observers/ads_page_load_metrics_observer.cc
+++ b/chrome/browser/page_load_metrics/observers/ads_page_load_metrics_observer.cc
@@ -11,6 +11,7 @@
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/string_util.h"
+#include "chrome/browser/page_load_metrics/observers/ads_detection.h"
 #include "chrome/browser/page_load_metrics/page_load_metrics_util.h"
 #include "content/public/browser/navigation_handle.h"
 #include "content/public/browser/render_frame_host.h"
@@ -21,14 +22,7 @@ namespace {
 
 const base::Feature kAdsFeature{"AdsMetrics", base::FEATURE_ENABLED_BY_DEFAULT};
 
-bool FrameIsAd(content::NavigationHandle* navigation_handle) {
-  // Because sub-resource filtering isn't always enabled, and doesn't work
-  // well in monitoring mode (no CSS enforcement), it's difficult to identify
-  // ads. Google ads are prevalent and easy to track, so we'll start by
-  // tracking those. Note that the frame name can be very large, so be careful
-  // to avoid full string searches if possible.
-  // TODO(jkarlin): Track other ad networks that are easy to identify.
-
+bool IsAdFrame(content::NavigationHandle* navigation_handle) {
   // In case the navigation aborted, look up the RFH by the Frame Tree Node
   // ID. It returns the committed frame host or the initial frame host for the
   // frame if no committed host exists. Using a previous host is fine because
@@ -39,20 +33,9 @@ bool FrameIsAd(content::NavigationHandle* navigation_handle) {
   content::RenderFrameHost* current_frame_host =
       navigation_handle->GetWebContents()->UnsafeFindFrameByFrameTreeNodeId(
           navigation_handle->GetFrameTreeNodeId());
-  if (current_frame_host) {
-    const std::string& frame_name = current_frame_host->GetFrameName();
-    if (base::StartsWith(frame_name, "google_ads_iframe",
-                         base::CompareCase::SENSITIVE) ||
-        base::StartsWith(frame_name, "google_ads_frame",
-                         base::CompareCase::SENSITIVE)) {
-      return true;
-    }
-  }
 
-  const GURL& url = navigation_handle->GetURL();
-  return url.host_piece() == "tpc.googlesyndication.com" &&
-         base::StartsWith(url.path_piece(), "/safeframe",
-                          base::CompareCase::SENSITIVE);
+  return IsAdFrame(current_frame_host ? current_frame_host->GetFrameName() : "",
+                   navigation_handle->GetURL());
 }
 
 void RecordParentExistsForSubFrame(bool parent_exists) {
@@ -114,7 +97,7 @@ void AdsPageLoadMetricsObserver::OnDidFinishSubFrameNavigation(
         // This is the top-most frame in the ad.
         UMA_HISTOGRAM_BOOLEAN(
             "PageLoad.Clients.Ads.Google.Navigations.AdFrameRenavigatedToAd",
-            FrameIsAd(navigation_handle));
+            IsAdFrame(navigation_handle));
       }
       return;
     }
@@ -122,7 +105,7 @@ void AdsPageLoadMetricsObserver::OnDidFinishSubFrameNavigation(
     // any child frames that were ads, those will still be recorded.
     UMA_HISTOGRAM_BOOLEAN(
         "PageLoad.Clients.Ads.Google.Navigations.NonAdFrameRenavigatedToAd",
-        FrameIsAd(navigation_handle));
+        IsAdFrame(navigation_handle));
   }
 
   // Determine who the parent frame's ad ancestor is.
@@ -139,7 +122,7 @@ void AdsPageLoadMetricsObserver::OnDidFinishSubFrameNavigation(
 
   AdFrameData* ad_data = parent_id_and_data->second;
 
-  if (!ad_data && FrameIsAd(navigation_handle)) {
+  if (!ad_data && IsAdFrame(navigation_handle)) {
     // This frame is not nested within an ad frame but is itself an ad.
     ad_frames_data_storage_.emplace_back(frame_tree_node_id);
     ad_data = &ad_frames_data_storage_.back();