Domain Reliability: Update mail.google.com config

components/domain_reliability/baked_in_configs/mail_google_com.json

 {
-  "config_version": "mail-google-com $Revision: #5 $",
+  "config_version": "mail-google-com $Revision: #6 $",
   "config_valid_until": 1446336000,
   "monitored_domain": "mail.google.com",
   "collectors": [
     {
       "upload_url": "https://clients2.google.com/domainreliability/upload"
     },
     {
       "upload_url": "https://beacons.gvt2.com/domainreliability/upload"
     },
     {
       "upload_url": "https://beacons2.gvt2.com/domainreliability/upload"
     },
     {
       "upload_url": "https://beacons3.gvt2.com/domainreliability/upload"
     },
     {
       "upload_url": "https://beacons4.gvt2.com/domainreliability/upload"
     }
   ],
   "monitored_resources": [
     {
       "resource_name": "gmail-home",
       "url_patterns": ["http*://mail.google.com/"],
       "success_sample_rate": 0.05,
       "failure_sample_rate": 1.00
     },
     {
+      "resource_name": "gmail-persistent",
+      "url_patterns": ["http*://mail.google.com/*/channel/bind*"],
+      "success_sample_rate": 0.05,
+      "failure_sample_rate": 1.00
+    },
+    {
       "resource_name": "gmail-other",
       "url_patterns": ["*"],
       "success_sample_rate": 0.05,
       "failure_sample_rate": 1.00
     }
   ]
 }