Added a comment about why testVTuneProfiler is disabled

BUG=437085

Review URL: https://codereview.chromium.org/778923003

Cr-Commit-Position: refs/heads/master@{#307046}

tools/telemetry/telemetry/core/platform/profiler/vtune_profiler_unittest.py

@@ -96,7 +96,10 @@ class TestVTuneProfiler(unittest.TestCase):
 
 class TestVTuneProfilerTabTestCase(tab_test_case.TabTestCase):
 
-  @benchmark.Disabled('android') # crbug.com/437085
+  # This test is only meant to be run if VTune is installed locally. Please
+  # run it locally if you are modifying related code, but it's disabled on the
+  # bots because they don't have VTune. See crbug.com/437085
+  @benchmark.Disabled
   def testVTuneProfiler(self):
     mock_subprocess = MockSubprocess()
     real_subprocess = vtune_profiler.subprocess