Add UNSCHEDULED_loading.mbi benchmark

This CL adds a loading telemetry benchmark that measures performance of
agents heavy web-sites, which the MBI team currently targets optimization.
The added benchmark is for an internal team use, and not yet scheduled on
the perf waterfall (thus UNSCHEDULED_ prefix).

Bug: 1051790
Change-Id: I96b9305bc8200153fa8587de338824d56bc47459
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2576056Reviewed-by: Kunihiko Sakamoto <ksakamoto@chromium.org>
Commit-Queue: Kouhei Ueno <kouhei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834530}

tools/perf/benchmark.csv

@@ -3,6 +3,7 @@ See the following link for directions for making changes to this data:,https://b
 Googlers can view additional information about internal perf infrastructure at,https://goto.google.com/chrome-benchmarking-sheet
 Benchmark name,Individual owners,Component,Documentation,Tags
 UNSCHEDULED_blink_perf.service_worker,"shimazu@chromium.org, falken@chromium.org, ting.shao@intel.com",Blink>ServiceWorker,https://bit.ly/blink-perf-benchmarks,
+UNSCHEDULED_loading.mbi,blink-isolation-dev@chromium.org,Blink>Internals>Modularization,https://bit.ly/loading-benchmarks,many_agents
 base_perftests,"skyostil@chromium.org, gab@chromium.org",Internals>SequenceManager,https://chromium.googlesource.com/chromium/src/+/HEAD/base/README.md#performance-testing,
 blink_perf.accessibility,dmazzoni@chromium.org,Blink>Accessibility,https://bit.ly/blink-perf-benchmarks,all
 blink_perf.bindings,"jbroman@chromium.org, yukishiino@chromium.org, haraken@chromium.org",Blink>Bindings,https://bit.ly/blink-perf-benchmarks,all

tools/perf/benchmarks/loading.py

@@ -79,3 +79,27 @@ class LoadingMobile(_LoadingBase):
   @classmethod
   def Name(cls):
     return 'loading.mobile'
+
+
+@benchmark.Info(emails=['blink-isolation-dev@chromium.org'],
+                component='Blink>Internals>Modularization',
+                documentation_url='https://bit.ly/loading-benchmarks')
+class LoadingMBI(_LoadingBase):
+  """ A benchmark measuring loading performance of the sites the MBI team cares
+  about. """
+  # TODO(rmhasan): Remove the SUPPORTED_PLATFORMS lists.
+  # SUPPORTED_PLATFORMS is deprecated, please put system specifier tags
+  # from expectations.config in SUPPORTED_PLATFORM_TAGS.
+  SUPPORTED_PLATFORM_TAGS = [platforms.MOBILE]
+  SUPPORTED_PLATFORMS = [story.expectations.ALL_MOBILE]
+
+  def CreateStorySet(self, options):
+    return page_sets.LoadingMobileStorySet(
+        cache_temperatures=[cache_temperature.ANY],
+        cache_temperatures_for_pwa=[],
+        traffic_settings=[traffic_setting.NONE, traffic_setting.REGULAR_3G],
+        include_tags=['many_agents'])
+
+  @classmethod
+  def Name(cls):
+    return 'UNSCHEDULED_loading.mbi'

tools/perf/page_sets/data/loading_mobile_5e1b45320b.wprgo.sha1

+5e1b45320b4c2b1f798c1ba885128dd407dcccf1
\ No newline at end of file