Suppress races on randomnessPid in sqlite (issue 459429)

BUG=459429
TBR=jyasskin@chromium.org

Review URL: https://codereview.chromium.org/941683003

Cr-Commit-Position: refs/heads/master@{#317044}
diff --git a/build/sanitizers/tsan_suppressions.cc b/build/sanitizers/tsan_suppressions.cc
index 5704f2d..ea95a943 100644
--- a/build/sanitizers/tsan_suppressions.cc
+++ b/build/sanitizers/tsan_suppressions.cc
@@ -325,6 +325,9 @@
 // https://crbug.com/455665
 "race:mojo::common::*::tick_clock\n"
 
+// https://crbug.com/459429
+"race:randomnessPid\n"
+
 // End of suppressions.
 ;  // Please keep this semicolon.