Add browse:social:twitter:2019 system health story

This CL was created automatically with tools/perf/update_wpr script

R=perezju@chromium.org

Bug: 878390
Change-Id: I4542da64c15feb4a72e5a6cefd9204ce0bfb0f16
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1816551
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Reviewed-by: Juan Antonio Navarro Pérez <perezju@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703740}

tools/perf/benchmarks/system_health_smoke_test.py

@@ -44,6 +44,7 @@ _DISABLED_TESTS = frozenset({
   'system_health.memory_mobile/browse:social:instagram',
   'system_health.memory_mobile/browse:news:reddit',
   'system_health.memory_mobile/browse:social:tumblr_infinite_scroll',
+  'system_health.memory_mobile/browse:social:twitter',
   'system_health.memory_mobile/browse:tools:maps',
   'system_health.memory_mobile/browse:news:cnn',
   'system_health.memory_mobile/browse:news:washingtonpost',

tools/perf/page_sets/data/system_health_mobile.json

@@ -120,6 +120,9 @@
         "browse:social:twitter": {
             "DEFAULT": "system_health_mobile_023.wprgo"
         },
+        "browse:social:twitter:2019": {
+            "DEFAULT": "system_health_mobile_34b94b48e8.wprgo"
+        },
         "browse:tech:discourse_infinite_scroll": {
             "DEFAULT": "system_health_mobile_062.wprgo"
         },

tools/perf/page_sets/data/system_health_mobile_34b94b48e8.wprgo.sha1

+34b94b48e8244003a936d97117604cd151aef0e7
\ No newline at end of file

tools/perf/page_sets/system_health/browsing_stories.py

@@ -271,6 +271,17 @@ class TwitterMobileStory(_ArticleBrowsingStory):
   SUPPORTED_PLATFORMS = platforms.MOBILE_ONLY
   TAGS = [story_tags.YEAR_2016]
 
+class TwitterMobileStory2019(_ArticleBrowsingStory):
+  NAME = 'browse:social:twitter:2019'
+  URL = 'https://www.twitter.com/nasa'
+  ITEM_SELECTOR = ('[class="css-901oao r-hkyrab r-1qd0xha r-1b43r93 r-16dba41 '
+      'r-ad9z0x r-bcqeeo r-bnwqim r-qvutc0"]')
+  SUPPORTED_PLATFORMS = platforms.MOBILE_ONLY
+  TAGS = [story_tags.YEAR_2019]
+
+  def _WaitForNavigation(self, action_runner):
+    action_runner.WaitForElement(selector=('[class="css-901oao css-16my406 '
+        'r-1qd0xha r-ad9z0x r-bcqeeo r-qvutc0"]'))
 
 class TwitterDesktopStory2018(_ArticleBrowsingStory):
   NAME = 'browse:social:twitter:2018'