[CT] Add desktop device when running run_benchmark

ct/go/worker_scripts/capture_skps/main.go

 // Application that captures SKPs from CT's webpage archives.
 package main
 
 import (
         "encoding/csv"
         "flag"
         "fmt"
         "io/ioutil"
         "os"
         "path/filepath"
@@ skipping 161 matching lines @@
                                         filepath.Join(util.TelemetryBinariesDir, util.BINARY_RUN_BENCHMARK),
                                         util.BenchmarksToTelemetryName[util.BENCHMARK_SKPICTURE_PRINTER],
                                         "--also-run-disabled-tests",
                                         "--page-repeat=1", // Only need one run for SKPs.
                                         "--skp-outdir=" + pathToSkps,
                                         "--extra-browser-args=" + util.DEFAULT_BROWSER_ARGS,
                                         "--user-agent=" + decodedPageset.UserAgent,
                                         "--urls-list=" + decodedPageset.UrlsList,
                                         "--archive-data-file=" + decodedPageset.ArchiveDataFile,
                                 }
-                                // Figure out which browser should be used.
+                                // Figure out which browser and device should be used.
                                 if *targetPlatform == util.PLATFORM_ANDROID {
                                         args = append(args, "--browser=android-chromium")
                                 } else {
                                         args = append(args, "--browser=exact", "--browser-executable="+chromiumBinary)
+                                        args = append(args, "--device=desktop")
                                 }
                                 // Set the PYTHONPATH to the pagesets and the telemetry dirs.
                                 env := []string{
                                         fmt.Sprintf("PYTHONPATH=%s:%s:%s:%s:$PYTHONPATH", pathToPagesets, util.TelemetryBinariesDir, util.TelemetrySrcDir, util.CatapultSrcDir),
                                         "DISPLAY=:0",
                                 }
                                 skutil.LogErr(
                                         util.ExecuteCmd("python", args, env, time.Duration(timeoutSecs)*time.Second, nil, nil))
 
                                 mutex.RUnlock()
@@ skipping 101 matching lines @@
         }
         writer := csv.NewWriter(csvFile)
         defer writer.Flush()
         for _, row := range [][]string{headers, values} {
                 if err := writer.Write(row); err != nil {
                         return fmt.Errorf("Could not write to %s: %s", csvPath, err)
                 }
         }
         return nil
 }