[CT] Add ability to run unlanded benchmarks on Chromium Perf

ct/go/poller/main.go

 /*
         The Cluster Telemetry poller checks for new pending tasks by polling the Cluster Telemetry
         frontend. Tasks are executed serially.
 */
 
 package main
 
 import (
         "flag"
         "fmt"
@@ skipping 293 matching lines @@
         chromium_perf.DBTask
 }
 
 func (task *ChromiumPerfTask) Execute() error {
         token := statusTracker.StartTask(CHROMIUM_PERF)
         runId := runId(task)
         // TODO(benjaminwagner): Since run_chromium_perf_on_workers only reads these in order to
         // upload to Google Storage, eventually we should move the upload step here to avoid writing
         // to disk.
         for fileSuffix, patch := range map[string]string{
-                ".chromium.patch": task.ChromiumPatch,
-                ".skia.patch":     task.SkiaPatch,
+                ".chromium.patch":  task.ChromiumPatch,
+                ".skia.patch":      task.SkiaPatch,
+                ".benchmark.patch": task.BenchmarkPatch,
         } {
                 // Add an extra newline at the end because git sometimes rejects patches due to
                 // missing newlines.
                 patch = patch + "\n"
                 patchPath := filepath.Join(os.TempDir(), runId+fileSuffix)
                 if err := ioutil.WriteFile(patchPath, []byte(patch), 0666); err != nil {
                         return err
                 }
                 defer skutil.Remove(patchPath)
         }
@@ skipping 289 matching lines @@
         pollAndExecOnce()
         for {
                 select {
                 case <-workerHealthTick:
                         doWorkerHealthCheck()
                 case <-pollTick:
                         pollAndExecOnce()
                 }
         }
 }