Re-enable Telemetry minidump tests

Re-enables the Telemetry minidump tests on most platforms. They were
disabled due to flakiness, but further investigation shows that the
flake rate was relatively low, and some flakes were caused by unrelated
issues, e.g. platform-wide issues.

Bug: 1084931
Change-Id: I31fab19af04faea49826dc827a45817da3de9397
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2318505
Auto-Submit: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791977}

tools/perf/core/minidump_unittest.py

@@ -34,8 +34,12 @@ class BrowserMinidumpTest(tab_test_case.TabTestCase):
   # Minidump symbolization doesn't work in ChromeOS local mode if the rootfs is
   # still read-only, so skip the test in that case.
   # TODO(crbug.com/1038043): Test is failing on chromeos-betty-chrome.
-  # Flaky on all platforms: https://crbug.com/1084931
-  @decorators.Disabled('all')
+  @decorators.Disabled(
+      'chromeos-local',
+      'chromeos-board-betty',
+      'chromeos-board-betty-pi-arc',
+      'win'  # https://crbug.com/1084931
+  )
   def testSymbolizeMinidump(self):
     # Wait for the browser to restart fully before crashing
     self._LoadPageThenWait('var sam = "car";', 'sam')
@@ -78,8 +82,12 @@ class BrowserMinidumpTest(tab_test_case.TabTestCase):
   # Minidump symbolization doesn't work in ChromeOS local mode if the rootfs is
   # still read-only, so skip the test in that case.
   # TODO(crbug.com/1038043): Test is failing on chromeos-betty-chrome.
-  # TODO(crbug.com/1084931): Test is failing on win, mac, others?
-  @decorators.Disabled('all')
+  @decorators.Disabled(
+      'chromeos-local',
+      'chromeos-board-betty',
+      'chromeos-board-betty-pi-arc',
+      'win'  # https://crbug.com/1084931
+  )
   def testMultipleCrashMinidumps(self):
     # Wait for the browser to restart fully before crashing
     self._LoadPageThenWait('var cat = "dog";', 'cat')