Log uses of isolate archive and exparchive when 'chromium' build tag is set.

client/cmd/isolate/exp_archive.go

 // Copyright 2015 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 package main
 
 import (
         "encoding/json"
         "errors"
         "fmt"
@@ skipping 270 matching lines @@
 
         end := time.Now()
 
         archiveDetails := &logpb.IsolateClientEvent_ArchiveDetails{
                 HitCount:    proto.Int64(int64(checker.Hit.Count)),
                 MissCount:   proto.Int64(int64(checker.Miss.Count)),
                 HitBytes:    &checker.Hit.Bytes,
                 MissBytes:   &checker.Miss.Bytes,
                 IsolateHash: []string{string(isolItem.Digest)},
         }
-        eventlogger := NewLogger(ctx, c.loggingFlags.EventlogEndpoint)
+        eventlogger := NewLogger(ctx, eventlogEndpoint(ctx, c.loggingFlags.EventlogEndpoint))
         op := logpb.IsolateClientEvent_ARCHIVE.Enum()
         if err := eventlogger.logStats(ctx, op, start, end, archiveDetails); err != nil {
                 log.Printf("Failed to log to eventlog: %v", err)
         }
 
         return nil
 }
 
 func (c *expArchiveRun) parseFlags(args []string) error {
         if len(args) != 0 {
@@ skipping 30 matching lines @@
 }
 
 func hashFile(path string) (isolated.HexDigest, error) {
         f, err := os.Open(path)
         if err != nil {
                 return "", err
         }
         defer f.Close()
         return isolated.Hash(f)
 }