Track 90th, 99th percentile instead of missed_frame_build_budget_count (#21754)

See https://github.com/flutter/flutter/pull/19121#issuecomment-419520765

dev/devicelab/lib/tasks/gallery.dart

@@ -72,8 +72,11 @@ class GalleryTransitionTest {
       'average_frame_build_time_millis',
       'worst_frame_build_time_millis',
       'missed_frame_build_budget_count',
+      '90th_percentile_frame_build_time_millis',
+      '99th_percentile_frame_build_time_millis',
       'average_frame_rasterizer_time_millis',
       'worst_frame_rasterizer_time_millis',
+      'missed_frame_rasterizer_budget_count',
       '90th_percentile_frame_rasterizer_time_millis',
       '99th_percentile_frame_rasterizer_time_millis',
     ]);

dev/devicelab/lib/tasks/perf_tests.dart

@@ -162,8 +162,11 @@ class PerfTest {
         'average_frame_build_time_millis',
         'worst_frame_build_time_millis',
         'missed_frame_build_budget_count',
+        '90th_percentile_frame_build_time_millis',
+        '99th_percentile_frame_build_time_millis',
         'average_frame_rasterizer_time_millis',
         'worst_frame_rasterizer_time_millis',
+        'missed_frame_rasterizer_budget_count',
         '90th_percentile_frame_rasterizer_time_millis',
         '99th_percentile_frame_rasterizer_time_millis',
       ]);

packages/flutter_driver/lib/src/driver/timeline_summary.dart

@@ -33,6 +33,13 @@ class TimelineSummary {
     return _averageInMillis(_extractFrameDurations());
   }
 
+  /// The [p]-th percentile frame rasterization time in milliseconds.
+  ///
+  /// Returns null if no frames were recorded.
+  double computePercentileFrameBuildTimeMillis(double p) {
+    return _percentileInMillis(_extractFrameDurations(), p);
+  }
+
   /// The longest frame build time in milliseconds.
   ///
   /// Returns null if no frames were recorded.
@@ -80,6 +87,8 @@ class TimelineSummary {
   Map<String, dynamic> get summaryJson {
     return <String, dynamic> {
       'average_frame_build_time_millis': computeAverageFrameBuildTimeMillis(),
+      '90th_percentile_frame_build_time_millis': computePercentileFrameBuildTimeMillis(90.0),
+      '99th_percentile_frame_build_time_millis': computePercentileFrameBuildTimeMillis(99.0),
       'worst_frame_build_time_millis': computeWorstFrameBuildTimeMillis(),
       'missed_frame_build_budget_count': computeMissedFrameBuildBudgetCount(),
       'average_frame_rasterizer_time_millis': computeAverageFrameRasterizerTimeMillis(),

packages/flutter_driver/test/src/timeline_summary_test.dart

@@ -266,6 +266,8 @@ void main() {
           ]).summaryJson,
           <String, dynamic>{
             'average_frame_build_time_millis': 7.0,
+            '90th_percentile_frame_build_time_millis': 11.0,
+            '99th_percentile_frame_build_time_millis': 11.0,
             'worst_frame_build_time_millis': 11.0,
             'missed_frame_build_budget_count': 2,
             'average_frame_rasterizer_time_millis': 8.0,
@@ -317,6 +319,8 @@ void main() {
         expect(json.decode(written), <String, dynamic>{
           'average_frame_build_time_millis': 7.0,
           'worst_frame_build_time_millis': 11.0,
+          '90th_percentile_frame_build_time_millis': 11.0,
+          '99th_percentile_frame_build_time_millis': 11.0,
           'missed_frame_build_budget_count': 2,
           'average_frame_rasterizer_time_millis': 8.0,
           '90th_percentile_frame_rasterizer_time_millis': 12.0,