Run telemetry_perf_unittests via isolate on "Mac tests", "Linux tests" and trybot with swarming

tools/perf/benchmarks/benchmark_smoke_unittest.py

Index: tools/perf/benchmarks/benchmark_smoke_unittest.py
diff --git a/tools/perf/benchmarks/benchmark_smoke_unittest.py b/tools/perf/benchmarks/benchmark_smoke_unittest.py
index e8e7bd9c325b434bc73c21f89d37e4de3c1e7c7f..79559216cdea1aacf2a7a7dc258644e037c4238a 100644
--- a/tools/perf/benchmarks/benchmark_smoke_unittest.py
+++ b/tools/perf/benchmarks/benchmark_smoke_unittest.py
@@ -18,6 +18,7 @@ from telemetry.core import discover
 from telemetry.testing import options_for_unittests
 from telemetry.testing import progress_reporter
 
+from benchmarks import chrome_signin_startup
 from benchmarks import image_decoding
 from benchmarks import indexeddb_perf
 from benchmarks import jetstream
@@ -83,6 +84,7 @@ _BLACK_LIST_TEST_MODULES = {
     octane,  # Often fails & take long time to timeout on cq bot.
     rasterize_and_record_micro,  # Always fails on cq bot.
     repaint,  # Often fails & takes long time to timeout on cq bot.
+    chrome_signin_startup,  # Failed on linux swarming bot (crbug.com/551236)
     spaceport,  # Takes 451 seconds.
     speedometer,  # Takes 101 seconds.
     jetstream,  # Take 206 seconds.