Disable PulseAudio for ASAN and TSAN configurations.

For some reason we're hanging in pa_context_connect(). We could do this
in a thread, but it's unclear this is a production Chrome problem, so
just disable for now.

R=jrummell

Bug: 986021, 1047655
Change-Id: I1042413690795016a28f4180eb7ea8f8c79e543f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2050785
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: John Rummell <jrummell@chromium.org>
Auto-Submit: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: John Rummell <jrummell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#740429}

media/media_options.gni

@@ -128,7 +128,14 @@ declare_args() {
     use_alsa = true
 
     # Pulse is not supported on Chromecast platforms.
-    if (!use_cras && !is_chromecast) {
+    #
+    # ASAN and TSAN will occasionally hang during pa_context_connect(), so we
+    # disable PulseAudio when these configurations are enabled.
+    #
+    # TODO(crbug.com/986021): We shouldn't have to do this, but it's unclear why
+    # our test bots are hanging and all of the ones that don't hang just fall
+    # back to ALSA after a connection error anyways.
+    if (!use_cras && !is_chromecast && !is_asan && !is_tsan) {
       use_pulseaudio = true
     }
   }