Adding page names to all endure pagesets

tools/perf/page_sets/gmail_expand_collapse_conversation.json

 {
   "description": "Chrome Endure test for GMail.",
   "archive_data_file": "../data/gmail_expand_collapse_conversation.json",
   "credentials_path": "../data/credentials.json",
   "user_agent_type": "desktop",
   "pages": [
     {
       "url": "https://mail.google.com/mail/u/0/#inbox/13c6a141fa95ffe0",
+      "name": "gmail_expand_collapse_conversation",
       "why": "Expand and Collapse a long conversation. # TODO(edmundyan): Find a long conversation rather than hardcode url",
       "credentials": "google",
       "navigate_steps": [
         { "action": "navigate" },
         { "action": "wait", "condition": "element", "selector": "img[alt=\"Expand all\"]" },
         { "action": "click_element", "selector": "img[alt=\"Expand all\"]" },
         { "action": "wait", "seconds": 5 },
         { "action": "wait", "condition": "element", "selector": "img[alt=\"Collapse all\"]" },
         { "action": "click_element", "selector": "img[alt=\"Collapse all\"]" },
         { "action": "wait", "seconds": 1 }
       ],
       "endure": [
         { "action": "wait", "condition": "element", "selector": "img[alt=\"Expand all\"]" },
         { "action": "click_element", "selector": "img[alt=\"Expand all\"]" },
         { "action": "wait", "seconds": 1 },
         { "action": "wait", "condition": "element", "selector": "img[alt=\"Collapse all\"]" },
         { "action": "click_element", "selector": "img[alt=\"Collapse all\"]" },
         { "action": "wait", "seconds": 1 }
       ]
     }
   ]
 }