base_perftest: Add data dependency on perf test runner script

This perf test should depend on //testing:run_perf_test in order to have
the correct wrapper scripts present in the isolate.

TBR=fdoray@chromium.org

Bug: 897751
Change-Id: I77d454984f6e8c6550961a6ecb240d201d289476
Reviewed-on: https://chromium-review.googlesource.com/c/1333449Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Commit-Queue: Sami Kyöstilä <skyostil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607569}

base/BUILD.gn

@@ -2083,6 +2083,10 @@ test("base_perftests") {
     "//testing/gtest",
     "//testing/perf",
   ]
+  data_deps = [
+    # Needed for isolate script to execute.
+    "//testing:run_perf_test",
+  ]
 
   if (is_android) {
     deps += [ "//testing/android/native_test:native_test_native_code" ]