Log First User Interaction in Page Load Metrics

chrome/browser/page_load_metrics/observers/page_load_metrics_observer_test_harness.cc

Index: chrome/browser/page_load_metrics/observers/page_load_metrics_observer_test_harness.cc
diff --git a/chrome/browser/page_load_metrics/observers/page_load_metrics_observer_test_harness.cc b/chrome/browser/page_load_metrics/observers/page_load_metrics_observer_test_harness.cc
index bd95836309aacaf22e8f4e2e91ea502ec65e07ad..28a7c22a013269abd5f2400478c4410399076f37 100644
--- a/chrome/browser/page_load_metrics/observers/page_load_metrics_observer_test_harness.cc
+++ b/chrome/browser/page_load_metrics/observers/page_load_metrics_observer_test_harness.cc
@@ -9,6 +9,7 @@
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "components/page_load_metrics/common/page_load_metrics_messages.h"
+#include "third_party/WebKit/public/web/WebInputEvent.h"
 
 namespace page_load_metrics {
 
@@ -119,6 +120,11 @@ void PageLoadMetricsObserverTestHarness::SimulateTimingAndMetadataUpdate(
                                web_contents()->GetMainFrame());
 }
 
+void PageLoadMetricsObserverTestHarness::SimulateInputEvent(
+    const blink::WebInputEvent& event) {
+  observer_->OnInputEvent(event);
+}
+
 const base::HistogramTester&
 PageLoadMetricsObserverTestHarness::histogram_tester() const {
   return histogram_tester_;