Add Javascript-Heavy tags for system health stories with heavy uses of JS

tools/perf/page_sets/system_health/loading_stories.py

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 from page_sets.system_health import platforms
+from page_sets.system_health import story_tags
 from page_sets.system_health import system_health_story
 
 from page_sets.login_helpers import dropbox_login
 from page_sets.login_helpers import google_login
 
 from telemetry import decorators
 
 
 class _LoadingStory(system_health_story.SystemHealthStory):
   """Abstract base class for single-page System Health user stories."""
@@ skipping 77 matching lines @@
 
 
 class LoadInstagramStory(_LoadingStory):
   NAME = 'load:social:instagram'
   URL = 'https://www.instagram.com/selenagomez/'
 
 
 class LoadPinterestStory(_LoadingStory):
   NAME = 'load:social:pinterest'
   URL = 'https://uk.pinterest.com/categories/popular/'
+  TAGS = [story_tags.JAVASCRIPT_HEAVY]
 
 
 class LoadTumblrStory(_LoadingStory):
   NAME = 'load:social:tumblr'
   # Redirects to the "http://" version.
   URL = 'https://50thousand.tumblr.com/'
+  TAGS = [story_tags.JAVASCRIPT_HEAVY]
 
 
 ################################################################################
 # News, discussion and knowledge portals and blogs.
 ################################################################################
 
 
 class LoadBbcStory(_LoadingStory):
   NAME = 'load:news:bbc'
   # Redirects to the "http://" version.
   URL = 'https://www.bbc.co.uk/news/world-asia-china-36189636'
 
 
 class LoadCnnStory(_LoadingStory):
   NAME = 'load:news:cnn'
   # Using "https://" shows "Your connection is not private".
   URL = 'http://edition.cnn.com'
+  TAGS = [story_tags.JAVASCRIPT_HEAVY]
 
 
 class LoadFlipboardStory(_LoadingStory):
   NAME = 'load:news:flipboard'
   URL = 'https://flipboard.com/explore'
 
 
 class LoadHackerNewsStory(_LoadingStory):
   NAME = 'load:news:hackernews'
   URL = 'https://news.ycombinator.com'
@@ skipping 199 matching lines @@
   NAME = 'load:tools:dropbox'
   URL = 'https://www.dropbox.com'
 
   def _Login(self, action_runner):
     dropbox_login.LoginAccount(action_runner, 'dropbox', self.credentials_path)
 
 
 class LoadWeatherStory(_LoadingStory):
   NAME = 'load:tools:weather'
   URL = 'https://weather.com/en-GB/weather/today/l/USCA0286:1:US'
+  TAGS = [story_tags.JAVASCRIPT_HEAVY]
 
 
 class LoadDriveStory(_LoadingStory):
   NAME = 'load:tools:drive'
   URL = 'https://drive.google.com/drive/my-drive'
+  TAGS = [story_tags.JAVASCRIPT_HEAVY]
 
   def _Login(self, action_runner):
     google_login.LoginGoogleAccount(action_runner, 'googletest',
                                     self.credentials_path)
 
 
 ################################################################################
 # In-browser games (HTML5 and Flash).
 ################################################################################
 
@@ skipping 32 matching lines @@
   NAME = 'load:games:miniclip'
   # Using "https://" causes "404 Not Found" during WPR recording.
   URL = 'http://www.miniclip.com/games/en/'
   SUPPORTED_PLATFORMS = platforms.DESKTOP_ONLY  # Requires Flash.
 
 
 class LoadAlphabettyStory(_LoadingStory):
   NAME = 'load:games:alphabetty'
   URL = 'https://king.com/play/alphabetty'
   SUPPORTED_PLATFORMS = platforms.DESKTOP_ONLY  # Requires Flash.