Added www.suddeutsche.de to the key_mobile_sites list

tools/perf/page_sets/key_mobile_sites.json

 {
     "description": "Mobile sites for M25",
     "credentials_path": "../data/credentials.json",
     "pages": [
         {
             "url": "http://www.androidpolice.com/2012/10/03/rumor-evidence-mounts-that-an-lg-optimus-g-nexus-is-coming-along-with-a-nexus-phone-certification-program/",
             "scrolling": {
                 "action": "scrolling_interaction"
             }
         },
@@ skipping 333 matching lines @@
             "url": "http://www.deviantart.com/",
             "scrolling": {
                 "action": "scrolling_interaction"
             }
         },
         {
             "url": "http://www.baidu.com/s?wd=barack+obama&rsv_bp=0&rsv_spt=3&rsv_sug3=9&rsv_sug=0&rsv_sug4=3824&rsv_sug1=3&inputT=4920",
             "scrolling": {
                 "action": "scrolling_interaction"
             }
+        },
+        {
+            "url": "http://www.sueddeutsche.de",
+            "scrolling": {
+                "action": "scrolling_interaction"
+            }
         }
     ]
 }