Adding page names to all endure pagesets

tools/perf/page_sets/calendar_forward_backward.json

 {
   "description": "Chrome Endure test for Google Calendar.",
   "archive_data_file": "../data/calendar_forward_backward.json",
   "credentials_path": "../data/credentials.json",
   "user_agent_type": "desktop",
   "pages": [
     {
       "url": "https://www.google.com/calendar/",
+      "name": "calendar_forward_backward",
       "why": "Click forward(4x) and backwards(4x) repeatedly",
       "credentials": "google",
       "navigate_steps" : [
         { "action": "navigate" },
         { "action": "wait", "seconds": 2 },
         { "action": "wait", "condition": "element", "selector":  "div[class~=\"navForward\"]" },
         { "action": "javascript", "expression": "(function() { var elem = document.createElement('meta');elem.name='viewport';elem.content='initial-scale=1';document.body.appendChild(elem); })();" }
       ],
       "endure": [
         { "action": "click_element", "selector": "div[class~=\"navForward\"]" },
@@ skipping 17 matching lines @@
         { "action": "click_element", "selector": "div[class~=\"navBack\"]" },
         { "action": "wait", "seconds": 2 },
         { "action": "wait", "condition": "element", "selector": "div[class~=\"navBack\"]" },
         { "action": "click_element", "selector": "div[class~=\"navBack\"]" },
         { "action": "wait", "seconds": 2 },
         { "action": "wait", "condition": "element", "selector": "div[class~=\"navForward\"]" }
       ]
     }
   ]
 }