Add metrics for tracking subresource filter activation suppression.

chrome/browser/page_load_metrics/observers/subresource_filter_metrics_observer.cc

Index: chrome/browser/page_load_metrics/observers/subresource_filter_metrics_observer.cc
diff --git a/chrome/browser/page_load_metrics/observers/subresource_filter_metrics_observer.cc b/chrome/browser/page_load_metrics/observers/subresource_filter_metrics_observer.cc
index 13f70d845fc7443d07374a9d96094ff0bd167969..989d902d951e63cc0efdc69eeaf8f5d52a089776 100644
--- a/chrome/browser/page_load_metrics/observers/subresource_filter_metrics_observer.cc
+++ b/chrome/browser/page_load_metrics/observers/subresource_filter_metrics_observer.cc
@@ -5,8 +5,11 @@
 #include "chrome/browser/page_load_metrics/observers/subresource_filter_metrics_observer.h"
 
 #include "chrome/browser/page_load_metrics/page_load_metrics_util.h"
+#include "components/subresource_filter/content/browser/content_subresource_filter_driver_factory.h"
 #include "third_party/WebKit/public/platform/WebLoadingBehaviorFlag.h"
 
+using subresource_filter::ContentSubresourceFilterDriverFactory;
+
 namespace internal {
 
 const char kHistogramSubresourceFilterFirstContentfulPaint[] =
@@ -47,8 +50,33 @@ const char kHistogramSubresourceFilterCacheBytes[] =
 const char kHistogramSubresourceFilterCount[] =
     "PageLoad.Clients.SubresourceFilter.Count";
 
+const char kHistogramSubresourceFilterActivationDecision[] =
+    "PageLoad.Clients.SubresourceFilter.ActivationDecision";
+const char kHistogramSubresourceFilterActivationDecisionReload[] =
+    "PageLoad.Clients.SubresourceFilter.ActivationDecision.LoadType.Reload";
+
 }  // namespace internal
 
+namespace {
+
+void LogActivationDecisionMetrics(
+    content::NavigationHandle* navigation_handle,
+    ContentSubresourceFilterDriverFactory::ActivationDecision decision) {
+  UMA_HISTOGRAM_ENUMERATION(
+      internal::kHistogramSubresourceFilterActivationDecision, decision,
+      ContentSubresourceFilterDriverFactory::ACTIVATION_DECISION_MAX);
+
+  if (ContentSubresourceFilterDriverFactory::NavigationIsPageReload(
+          navigation_handle->GetURL(), navigation_handle->GetReferrer(),
+          navigation_handle->GetPageTransition())) {
+    UMA_HISTOGRAM_ENUMERATION(
+        internal::kHistogramSubresourceFilterActivationDecisionReload, decision,
+        ContentSubresourceFilterDriverFactory::ACTIVATION_DECISION_MAX);
+  }
+}
+
+}  // namespace
+
 page_load_metrics::PageLoadMetricsObserver::ObservePolicy
 SubresourceFilterMetricsObserver::FlushMetricsOnAppEnterBackground(
     const page_load_metrics::PageLoadTiming& timing,
@@ -62,6 +90,19 @@ SubresourceFilterMetricsObserver::FlushMetricsOnAppEnterBackground(
   return STOP_OBSERVING;
 }
 
+page_load_metrics::PageLoadMetricsObserver::ObservePolicy
+SubresourceFilterMetricsObserver::OnCommit(
+    content::NavigationHandle* navigation_handle) {
+  const auto* subres_filter =
+      ContentSubresourceFilterDriverFactory::FromWebContents(
+          navigation_handle->GetWebContents());
+  if (subres_filter)
+    LogActivationDecisionMetrics(
+        navigation_handle,
+        subres_filter->GetActivationDecisionForLastCommittedPageLoad());
+  return CONTINUE_OBSERVING;
+}
+
 void SubresourceFilterMetricsObserver::OnComplete(
     const page_load_metrics::PageLoadTiming& timing,
     const page_load_metrics::PageLoadExtraInfo& info) {