Add UKM metric tracking for various page load metric observers.

chrome/browser/page_load_metrics/observers/from_gws_page_load_metrics_observer.cc

Index: chrome/browser/page_load_metrics/observers/from_gws_page_load_metrics_observer.cc
diff --git a/chrome/browser/page_load_metrics/observers/from_gws_page_load_metrics_observer.cc b/chrome/browser/page_load_metrics/observers/from_gws_page_load_metrics_observer.cc
index 60ff8c602eebe8b8d39c2bb834d028e628b0a0d9..81491ab2c152ea8f109bcbb09f25c8392d27fb70 100644
--- a/chrome/browser/page_load_metrics/observers/from_gws_page_load_metrics_observer.cc
+++ b/chrome/browser/page_load_metrics/observers/from_gws_page_load_metrics_observer.cc
@@ -7,8 +7,10 @@
 
 #include "base/metrics/histogram_macros.h"
 #include "base/strings/string_util.h"
+#include "chrome/browser/browser_process.h"
 #include "chrome/browser/page_load_metrics/page_load_metrics_util.h"
 #include "chrome/common/page_load_metrics/page_load_timing.h"
+#include "components/ukm/public/ukm_recorder.h"
 
 using page_load_metrics::PageAbortReason;
 
@@ -109,6 +111,8 @@ const char kHistogramFromGWSForegroundDurationWithoutPaint[] =
 const char kHistogramFromGWSForegroundDurationNoCommit[] =
     "PageLoad.Clients.FromGoogleSearch.PageTiming.ForegroundDuration.NoCommit";
 
+const char kUkmFromGoogleSearchName[] = "FromGoogleSearch";
+
 }  // namespace internal
 
 namespace {
@@ -359,6 +363,7 @@ FromGWSPageLoadMetricsObserver::OnCommit(
           navigation_handle->GetPageTransition()));
 
   logger_.SetNavigationStart(navigation_handle->NavigationStart());
+  logger_.OnCommit(navigation_handle, source_id);
   return CONTINUE_OBSERVING;
 }
 
@@ -435,6 +440,18 @@ void FromGWSPageLoadMetricsObserver::OnUserInput(
   logger_.OnUserInput(event);
 }
 
+void FromGWSPageLoadMetricsLogger::OnCommit(
+    content::NavigationHandle* navigation_handle,
+    ukm::SourceId source_id) {
+  if (!ShouldLogPostCommitMetrics(navigation_handle->GetURL()))
+    return;
+  ukm::UkmRecorder* ukm_recorder = g_browser_process->ukm_recorder();
+  if (ukm_recorder) {
+    ukm_recorder->GetEntryBuilder(source_id,
+                                  internal::kUkmFromGoogleSearchName);
+  }
+}
+
 void FromGWSPageLoadMetricsLogger::OnComplete(
     const page_load_metrics::mojom::PageLoadTiming& timing,
     const page_load_metrics::PageLoadExtraInfo& extra_info) {