Grant more downstream SwiftShader approval rights.

Change-Id: Idc041213e40c0650b52209de199a098bd26a1b39
Reviewed-on: https://swiftshader-review.googlesource.com/c/21328
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
diff --git a/OWNERS b/OWNERS
index a402880..c1fc9da 100644
--- a/OWNERS
+++ b/OWNERS
@@ -2,8 +2,15 @@
 #
 # This list is used by Chromium and Android to make sure that one of the owners
 # in this list has approved a SwiftShader related change before landing it.
+#
+# Note that the upstream source-of-truth git repository at
+# swiftshader.googlesource.com/SwiftShader has ownership and access control
+# seperate from those controlled by this OWNERS file.
 
 nicolascapens@google.com
 sugoi@google.com
+shannonwoods@google.com
+chrisforbes@google.com
+cwallez@google.com
 
 # COMPONENT: Internals>GPU>SwiftShader
\ No newline at end of file