Add loading mobile benchmark (but disable it)

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 0459c67540ef4b94a2330dac101194df9ecb87ac..49bbb48d4f3ce448fdd6085ec82ecaccb01f3f03 100644
--- a/tools/perf/benchmarks/page_cycler_v2.py
+++ b/tools/perf/benchmarks/page_cycler_v2.py
@@ -17,32 +17,36 @@ from telemetry.timeline import chrome_trace_category_filter
 from telemetry.web_perf import timeline_based_measurement
 
 
-class _PageCyclerV2(perf_benchmark.PerfBenchmark):
-  options = {'pageset_repeat': 2}
+def TimelineBasedMeasurementOptionsForLoadingMetric():
+  cat_filter = chrome_trace_category_filter.ChromeTraceCategoryFilter()
 
-  def CreateTimelineBasedMeasurementOptions(self):
-    cat_filter = chrome_trace_category_filter.ChromeTraceCategoryFilter()
+  # "blink.console" is used for marking ranges in
+  # cache_temperature.MarkTelemetryInternal.
+  cat_filter.AddIncludedCategory('blink.console')
+
+  # "navigation" and "blink.user_timing" are needed to capture core
+  # navigation events.
+  cat_filter.AddIncludedCategory('navigation')
+  cat_filter.AddIncludedCategory('blink.user_timing')
 
-    # "blink.console" is used for marking ranges in
-    # cache_temperature.MarkTelemetryInternal.
-    cat_filter.AddIncludedCategory('blink.console')
+  # "loading" is needed for first-meaningful-paint computation.
+  cat_filter.AddIncludedCategory('loading')
 
-    # "navigation" and "blink.user_timing" are needed to capture core
-    # navigation events.
-    cat_filter.AddIncludedCategory('navigation')
-    cat_filter.AddIncludedCategory('blink.user_timing')
+  # "toplevel" category is used to capture TaskQueueManager events
+  # necessary to compute time-to-interactive.
+  cat_filter.AddIncludedCategory('toplevel')
 
-    # "loading" is needed for first-meaningful-paint computation.
-    cat_filter.AddIncludedCategory('loading')
+  tbm_options = timeline_based_measurement.Options(
+      overhead_level=cat_filter)
+  tbm_options.SetTimelineBasedMetrics(['loadingMetric'])
+  return tbm_options
 
-    # "toplevel" category is used to capture TaskQueueManager events
-    # necessary to compute time-to-interactive.
-    cat_filter.AddIncludedCategory('toplevel')
 
-    tbm_options = timeline_based_measurement.Options(
-        overhead_level=cat_filter)
-    tbm_options.SetTimelineBasedMetrics(['loadingMetric'])
-    return tbm_options
+class _PageCyclerV2(perf_benchmark.PerfBenchmark):
+  options = {'pageset_repeat': 2}
+
+  def CreateTimelineBasedMeasurementOptions(self):
+    return TimelineBasedMeasurementOptionsForLoadingMetric()
 
   @classmethod
   def ShouldDisable(cls, possible_browser):