Update browse:media:youtube system health story for 2019

This CL was created (mostly) automatically with tools/perf/update_wpr script

This updates the youtube 2019 story, which is necessary because the 2018
recorded story makes use of Polymer 1 and the deprecated (and soon to be
removed) Web Components v0 features. This recording should not contain uses
of those features, *except* for HTML Imports. That will likely require
another re-record later.

Bug: 911943
Change-Id: I1905308e0448ec85d6a581e7bccd72fe86b3bddb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1872157
Commit-Queue: Mason Freed <masonfreed@chromium.org>
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709664}

tools/perf/page_sets/data/system_health_desktop.json

@@ -27,6 +27,10 @@
             "mac": "system_health_desktop_040.wprgo",
             "win": "system_health_desktop_047.wprgo"
         },
+        "browse:media:youtube:2019": {
+            "DEFAULT": "system_health_desktop_d48f7fff0a.wprgo",
+            "linux": "system_health_desktop_d48f7fff0a.wprgo"
+        },
         "browse:media:youtubetv:2019": {
             "DEFAULT": "system_health_desktop_e53598d1f4.wprgo"
         },

tools/perf/page_sets/data/system_health_desktop_d48f7fff0a.wprgo.sha1

+d48f7fff0a37d4fcbfc5e430f15232996d52460d
\ No newline at end of file

tools/perf/page_sets/system_health/browsing_stories.py

@@ -604,6 +604,23 @@ class YouTubeMobileStory(_MediaBrowsingStory):
           story_tags.HEALTH_CHECK, story_tags.YEAR_2016]
 
 
+class YouTubeDesktopStory2019(_MediaBrowsingStory):
+  """Load a typical YouTube video then navigate to a next few videos. Stop and
+  watch each video for a few seconds.
+  """
+  NAME = 'browse:media:youtube:2019'
+  URL = 'https://www.youtube.com/watch?v=QGfhS1hfTWw&autoplay=0'
+  ITEM_SELECTOR = 'ytd-compact-video-renderer.ytd-watch-next-secondary-results-renderer a'
+  SUPPORTED_PLATFORMS = platforms.DESKTOP_ONLY
+  IS_SINGLE_PAGE_APP = True
+  # A longer view time allows videos to load and play.
+  ITEM_VIEW_TIME_IN_SECONDS = 5
+  ITEMS_TO_VISIT = 8
+  ITEM_SELECTOR_INDEX = 3
+  PLATFORM_SPECIFIC = True
+  TAGS = [story_tags.JAVASCRIPT_HEAVY, story_tags.YEAR_2019]
+
+
 class YouTubeTVDesktopStory2019(_MediaBrowsingStory):
   """Load a typical YouTube TV video then navigate to a next few videos. Stop
   and watch each video for a few seconds.