Suppress some ThreadSanitizer v2 errors in NSS.

BUG=292999
NOTRY=true
TBR=glider@chromium.org

Review URL: https://chromiumcodereview.appspot.com/23868033

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@223476 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/tsan_v2/suppressions.txt

@@ -128,3 +128,8 @@ race:content::WebRtcAudioCapturer::SetCapturerSource
 
 # http://crbug.com/290964
 race:PostponeInterruptsScope
+
+# http://crbug.com/292999
+race:LocksInitializedEarly
+race:cacheLock
+race:net/third_party/nss/ssl/sslsecur.c