telemetry: Fix running smoke tests.

Fix running smoke tests after changes in catapult:
  https://chromium-review.googlesource.com/c/catapult/+/1474597
After that change, it is necessary to update the target platforms
for the browser from the benchmark's supported platforms.

BUG=932409

Change-Id: I7cddec057d987e342890d180485f54f927c61f7a
Reviewed-on: https://chromium-review.googlesource.com/c/1481742
Auto-Submit: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634419}

tools/perf/benchmarks/system_health_smoke_test.py

@@ -235,6 +235,11 @@ def GenerateBenchmarkOptions(benchmark_class):
   # all crashes and hence remove the need to enable logging in actual perf
   # benchmarks.
   options.browser_options.logging_verbosity = 'non-verbose'
+  # TODO(sadrul): Remove the check once catapult roll happens.
+  # https://crbug.com/932409
+  if "GetSupportedPlatforms" in dir(benchmark_class):
+    options.target_platforms = benchmark_class.GetSupportedPlatforms(
+        benchmark_class.SUPPORTED_PLATFORMS)
   return options