Valgrind: Widen a suppression and suppress a new error.

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 # running overnight and removing outdated bugs/suppressions.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 1043 matching lines @@
    fun:base::debug::TraceSamplingThread::ThreadMain
    fun:base::::ThreadFunc
 }
 {
    bug_178433b
    ThreadSanitizer:Race
    fun:base::internal::scoped_ptr_impl::get
    ...
    fun:base::debug::TraceSamplingThread::ThreadMain
 }
+{
+  bug_222601a
+  ThreadSanitizer:Race
+  fun:XFixesFindDisplay
+  fun:XFixesQueryExtension
+  fun:media::::ScreenCapturerLinux::Init
+}
+{
+  bug_222601b
+  ThreadSanitizer:Race
+  fun:XextFindDisplay
+  ...
+  fun:XShmQueryVersion
+  fun:media::XServerPixelBuffer::InitShm
+  fun:media::XServerPixelBuffer::Init
+  fun:media::::ScreenCapturerLinux::Init
+}