Modify list_system_health_stories to generate_system_health_csv

tools/perf/page_sets/system_health/searching_stories.py

Index: tools/perf/page_sets/system_health/searching_stories.py
diff --git a/tools/perf/page_sets/system_health/searching_stories.py b/tools/perf/page_sets/system_health/searching_stories.py
index bdbc0460d4290e284179d56ad92633941e4f491e..ea0c41ba0ae053c10d9a3e7e83e1e087ce2a396e 100644
--- a/tools/perf/page_sets/system_health/searching_stories.py
+++ b/tools/perf/page_sets/system_health/searching_stories.py
@@ -13,6 +13,13 @@ from devil.android.sdk import keyevent # pylint: disable=import-error
 
 # TODO(ssid): Rename the search stories to browse stories crbug.com/708300.
 class SearchGoogleStory(system_health_story.SystemHealthStory):
+  """ A typical Google search user story.
+  Issue the search query "what is science" in the search box and press Enter.
+  Wait for the search result page to be loaded, then scroll to the Wikipedia
+  result.
+  Navigate to wikipedia page by clicking on the result and wait for it to be
+  fully loaded.
+  """
   NAME = 'search:portal:google'
   URL = 'https://www.google.co.uk/'
   TAGS = [story_tags.EMERGING_MARKET]
@@ -74,12 +81,18 @@ class SearchOmniboxStory(system_health_story.SystemHealthStory):
 class MobileNewTabPageStory(system_health_story.SystemHealthStory):
   """Story that loads new tab page and performs searches.
 
-  For each of the search queries in |_SEARCH_TEXTS| below, this story does:
+  For each of the search queries in in the list below, this story does:

[perezju, 2017/05/19 13:48:29]

nit: "in in" -> "in"

[nednguyen, 2017/05/19 15:07:50]

Done.

    - enter the search query on the new tab page search box
    - read results
    - navigates back to new tab page
-  """
 
+  List of search queries:
+    'does google know everything',
+    'most famous paintings',
+    'current weather',
+    'best movies 2016',
+    'how to tie a tie'

[perezju, 2017/05/19 13:48:29]

I'm not very happy about duplicating this list here. Could be easy to forget
updating if at some point we change the other list below.

[nednguyen, 2017/05/19 15:07:50]

I removed the duplicating list for now. 

+  """
   NAME = 'browse:chrome:newtab'
   URL = 'chrome://newtab'
   _SEARCH_TEXTS = ['does google know everything',