Widen some Memcheck & TSan suppressions to account for the recent code changes

tools/valgrind/tsan/suppressions.txt

 # There are a few kinds of suppressions in this file.
 # 1. third party stuff we have no control over
 #
 # 2. intentional unit test errors, or stuff that is somehow a false positive
 # in our own code, or stuff that is so trivial it's not worth fixing
 #
 # 3. Suppressions for real chromium bugs that are not yet fixed.
 # These should all be in chromium's bug tracking system (but a few aren't yet).
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 536 matching lines @@
   ...
   fun:media::FFmpegVideoDecoder::Flush
 }
 {
   bug_93932_g
   ThreadSanitizer:Race
   ...
   fun:frame_thread_free
   ...
   fun:avcodec_close
+}
+{
+  bug_93932_h
+  ThreadSanitizer:Race
   ...
+  fun:render_slice
+  fun:vp3_decode_frame
+  fun:frame_worker_thread
 }
 {
   bug_100020
   ThreadSanitizer:Race
   fun:linked_ptr_internal::join
   fun:linked_ptr::copy
   ...
   fun:HostContentSettingsMap::GetDefaultContentSetting
 }
 {
@@ skipping 194 matching lines @@
 }
 {
   bug_108411
   ThreadSanitizer:Race
   ...
   fun:pa_rtpoll_run
 }
 {
   bug_112200
   ThreadSanitizer:Race
-  fun:park_frame_worker_threads
+  ...
   fun:ff_thread_flush
   fun:avcodec_flush_buffers
   fun:avcodec_flush_buffers
+  ...
   fun:media::FFmpegVideoDecoder::Flush
   fun:base::internal::RunnableAdapter::Run
 }
 
 {
   bug_112419
   ThreadSanitizer:Race
   ...
   fun:::OCSPTrySendAndReceive
   fun:pkix_pl_Pk11CertStore_GetCRL
@@ skipping 90 matching lines @@
   fun:content::BrowserThread::PostTask
   fun:PluginLoaderPosix::GetPluginsToLoad
   fun:base::internal::RunnableAdapter::Run
 }
 {
   bug_118319_c
   ThreadSanitizer:Race
   fun:base::Thread::ThreadMain
   fun:base::::ThreadFunc
 }