[cc] Use more standard enumerator names part #2

Use more standard enumerator names in //cc part #2

https://google.github.io/styleguide/cppguide.html#Enumerator_Names

There are still some non-standard enumerator names in the //cc
directory, which will be modified in subsequent patches.

Bug: 1480233
Change-Id: I3836386341d2be5000ab95aed8390a04aa659279
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4854728
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Reviewed-by: Stefan Zager <szager@chromium.org>
Commit-Queue: Ho Cheung <uioptt24@gmail.com>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1196671}

diff --git a/cc/metrics/average_lag_tracker_unittest.cc b/cc/metrics/average_lag_tracker_unittest.cc
index da0942e..8bb2423 100644
--- a/cc/metrics/average_lag_tracker_unittest.cc
+++ b/cc/metrics/average_lag_tracker_unittest.cc

@@ -36,7 +36,7 @@
                                  float predicted_delta = 0) {
     AverageLagTracker::EventInfo event_info(
         delta, predicted_delta != 0 ? predicted_delta : delta, event_time,
-        AverageLagTracker::EventType::ScrollBegin);
+        AverageLagTracker::EventType::kScrollbegin);
     event_info.finish_timestamp = frame_time;
     average_lag_tracker_->AddScrollEventInFrame(event_info);
   }
@@ -47,7 +47,7 @@
                                   float predicted_delta = 0) {
     AverageLagTracker::EventInfo event_info(
         delta, predicted_delta != 0 ? predicted_delta : delta, event_time,
-        AverageLagTracker::EventType::ScrollUpdate);
+        AverageLagTracker::EventType::kScrollupdate);
     event_info.finish_timestamp = frame_time;
     average_lag_tracker_->AddScrollEventInFrame(event_info);
   }