Upload generated frame-request-pending stats (#135645)

These values are generated since flutter/flutter#135279, but I didn't know to add the new keys to this list to get them to upload.

Part of flutter/flutter#129150

Author: moffatman

dev/devicelab/lib/tasks/perf_tests.dart

@@ -1358,6 +1358,9 @@ const List<String> _kCommonScoreKeys = <String>[
   '99th_percentile_picture_cache_memory',
   'worst_picture_cache_memory',
   'old_gen_gc_count',
+  'average_frame_request_pending_latency',
+  '90th_percentile_frame_request_pending_latency',
+  '99th_percentile_frame_request_pending_latency'
 ];
 
 /// Measures how long it takes to compile a Flutter app to JavaScript and how

dev/devicelab/test/perf_tests_test.dart

@@ -58,6 +58,9 @@ void main() {
       'average_vsync_transitions_missed': 1,
       '90th_percentile_vsync_transitions_missed': 1,
       '99th_percentile_vsync_transitions_missed': 1,
+      'average_frame_request_pending_latency': 0.1,
+      '90th_percentile_frame_request_pending_latency': 0.1,
+      '99th_percentile_frame_request_pending_latency': 0.1,
     };
     const String resultFileName = 'fake_result';
     void driveCallback(List<String> arguments) {
@@ -108,6 +111,9 @@ void main() {
       '90hz_frame_percentage': 0.4,
       '120hz_frame_percentage': 0.6,
       'illegal_refresh_rate_frame_count': 10,
+      'average_frame_request_pending_latency': 0.1,
+      '90th_percentile_frame_request_pending_latency': 0.1,
+      '99th_percentile_frame_request_pending_latency': 0.1,
     };
     const String resultFileName = 'fake_result';
     void driveCallback(List<String> arguments) {