Add new tests to presubmit, fix errors

perf/go/ingester/ingester.go

 package ingester
 
 import (
         "fmt"
         "io"
         "net/http"
 
         "time"
 )
 
@@ skipping 152 matching lines @@
         return nil
 }
 
 // Flush writes the current Tile out, should be called once all updates are
 // done. Note that Move() writes out the former Tile as it moves to a new Tile,
 // so this only needs to be called at the end of looping over a set of work.
 func (tt TileTracker) Flush() {
         glog.Info("Flushing Tile.")
         if tt.lastTileNum != -1 {
                 if err := tt.tileStore.Put(0, tt.lastTileNum, tt.currentTile); err != nil {
-                        glog.Error("Failed to write Tile: %s", err)
+                        glog.Errorf("Failed to write Tile: %s", err)
                 }
         }
 }
 
 // Tile returns the current Tile.
 func (tt TileTracker) Tile() *types.Tile {
         return tt.currentTile
 }
 
 // Offset returns the Value offset of a commit in a Trace.
@@ skipping 178 matching lines @@
         retval := []*ResultsFileLocation{}
         for _, dir := range dirs {
                 files, err := getFilesFromGSDir(dir, last, storage)
                 if err != nil {
                         return nil, err
                 }
                 retval = append(retval, files...)
         }
         return retval, nil
 }