Use swarming in run_lua CT task

ct/go/util/constants.go

 package util
 
 import (
         "fmt"
         "path/filepath"
         "time"
 )
 
 const (
         NUM_WORKERS_PROD      int = 100
@@ skipping 178 matching lines @@
         SWARMING_DIR_NAME = "swarming"
         SWARMING_POOL     = "CT"
         // Timeouts.
         BATCHARCHIVE_TIMEOUT = 10 * time.Minute
         XVFB_TIMEOUT         = 5 * time.Minute
         // Isolate files.
         CREATE_PAGESETS_ISOLATE        = "create_pagesets.isolate"
         CAPTURE_ARCHIVES_ISOLATE       = "capture_archives.isolate"
         CAPTURE_SKPS_ISOLATE           = "capture_skps.isolate"
         CAPTURE_SKPS_FROM_PDFS_ISOLATE = "capture_skps_from_pdfs.isolate"
+        RUN_LUA_ISOLATE                = "run_lua.isolate"
 )
 
 type PagesetTypeInfo struct {
         NumPages                   int
         CSVSource                  string
         UserAgent                  string
         CaptureArchivesTimeoutSecs int
         CreatePagesetsTimeoutSecs  int
         CaptureSKPsTimeoutSecs     int
         RunChromiumPerfTimeoutSecs int
@@ skipping 128 matching lines @@
 
         SupportedPageSetsToDesc = map[string]string{
                 PLATFORM_LINUX:   "Linux (100 Ubuntu12.04 machines)",
                 PLATFORM_ANDROID: "Android (100 N5 devices)",
         }
 )
 
 func NumWorkers() int {
         return len(Slaves)
 }