Log First User Interaction in Page Load Metrics

blimp/engine/feature/engine_render_widget_feature_unittest.cc

Index: blimp/engine/feature/engine_render_widget_feature_unittest.cc
diff --git a/blimp/engine/feature/engine_render_widget_feature_unittest.cc b/blimp/engine/feature/engine_render_widget_feature_unittest.cc
index 4d7838211292f3fa62063d5977c535acd81fc4e8..417f54993cc22e0a73426cf536eb902545f5b122 100644
--- a/blimp/engine/feature/engine_render_widget_feature_unittest.cc
+++ b/blimp/engine/feature/engine_render_widget_feature_unittest.cc
@@ -96,6 +96,8 @@ class MockRenderWidgetHost
       const KeyPressEventCallback& callback) override {}
   void AddMouseEventCallback(const MouseEventCallback& callback) override {}
   void RemoveMouseEventCallback(const MouseEventCallback& callback) override {}
+  void AddInputEventObserver(InputEventObserver* observer) override {}
+  void RemoveInputEventObserver(InputEventObserver* observer) override {}
   void GetWebScreenInfo(blink::WebScreenInfo* result) override {}
   bool GetScreenColorProfile(std::vector<char>* color_profile) override {
     return false; }