Add new tests to presubmit, fix errors

perf/go/skiaperf/main.go

 package main
 
 import (
         "encoding/json"
         "flag"
         "fmt"
         ehtml "html"
         "html/template"
         "math/rand"
         "net/http"
@@ skipping 451 matching lines @@
         }
         writeClusterSummaries(summary, w, r)
 }
 
 // getTile retrieves a tile from the disk
 func getTile(tileScale, tileNumber int) (*types.Tile, error) {
         start := time.Now()
         tile, err := nanoTileStore.Get(int(tileScale), int(tileNumber))
         glog.Infoln("Time for tile load: ", time.Since(start).Nanoseconds())
         if err != nil || tile == nil {
-                return nil, fmt.Errorf("Unable to get tile from tilestore: ", err)
+                return nil, fmt.Errorf("Unable to get tile from tilestore: %s", err)
         }
         return tile, nil
 }
 
 // tileHandler accepts URIs like /tiles/0/1
 // where the URI format is /tiles/<tile-scale>/<tile-number>
 //
 // It returns JSON of the form:
 //
 //  {
@@ skipping 617 matching lines @@
         http.HandleFunc("/compare/", autogzip.HandleFunc(compareHandler))
         http.HandleFunc("/calc/", autogzip.HandleFunc(calcHandler))
         http.HandleFunc("/help/", autogzip.HandleFunc(helpHandler))
         http.HandleFunc("/oauth2callback/", login.OAuth2CallbackHandler)
         http.HandleFunc("/logout/", login.LogoutHandler)
         http.HandleFunc("/loginstatus/", login.StatusHandler)
 
         glog.Infoln("Ready to serve.")
         glog.Fatal(http.ListenAndServe(*port, nil))
 }