Add necessary script for telemetry_perf_tests_new target

# No try because trybot failures are unrelated to the change.
NOTRY=true

Bug: 758630
Change-Id: Ie3adb8ed81ecb5dab1578391f0fca0785c0ca23e
Reviewed-on: https://chromium-review.googlesource.com/703501
Commit-Queue: Stephen Martinis <martiniss@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506888}

chrome/test/BUILD.gn

@@ -3007,6 +3007,11 @@ group("telemetry_perf_tests_new") {
   deps = [
     "//chrome/test:telemetry_perf_tests",
   ]
+
+  data = [
+    # Needed for isolate script to execute.
+    "//testing/scripts/run_multiple_telemetry_benchmarks_as_googletest.py",
+  ]
 }
 
 group("angle_perftests") {