Reland: [PCv2] Add tracing category needed for computing ttfmp

tools/perf/benchmarks/page_cycler_v2.py

Index: tools/perf/benchmarks/page_cycler_v2.py
diff --git a/tools/perf/benchmarks/page_cycler_v2.py b/tools/perf/benchmarks/page_cycler_v2.py
index 9678adee5e4928f9fb8260ee5138536d3612517f..3319c9d6d4d903d46a28b4216bd9854f50789157 100644
--- a/tools/perf/benchmarks/page_cycler_v2.py
+++ b/tools/perf/benchmarks/page_cycler_v2.py
@@ -22,13 +22,17 @@ class _PageCyclerV2(perf_benchmark.PerfBenchmark):
     cat_filter = tracing_category_filter.TracingCategoryFilter(
         filter_string='blink.console,navigation,blink.user_timing,loading')
 
+    # Below categories are needed for first-meaningful-paint computation.
+    cat_filter.AddDisabledByDefault('disabled-by-default-blink.debug.layout')
+    cat_filter.AddIncludedCategory('devtools.timeline')
+
     tbm_options = timeline_based_measurement.Options(
         overhead_level=cat_filter)
     tbm_options.SetTimelineBasedMetric('firstPaintMetric')
     return tbm_options
 
 
-@benchmark.Disabled('win')  # crbug.com/615178
+@benchmark.Disabled('win', 'reference')  # crbug.com/615178, crbug.com/619254
 class PageCyclerV2Typical25(_PageCyclerV2):
   """Page load time benchmark for a 25 typical web pages.