Add Linux and Win site isolation builder_testers to chromium.fyi waterfall.

masters/master.chromium.fyi/master.cfg

Index: masters/master.chromium.fyi/master.cfg
diff --git a/masters/master.chromium.fyi/master.cfg b/masters/master.chromium.fyi/master.cfg
index 038a2bef2ebcb53619408210f85c22785ef6ea3c..27f2c776e7137fecf364498b24879ff1dd359b86 100644
--- a/masters/master.chromium.fyi/master.cfg
+++ b/masters/master.chromium.fyi/master.cfg
@@ -1823,6 +1823,20 @@ b_chromium_openssl_mac = {
   'auto_reboot': True,
 }
 
+b_chromium_site_isolation_linux = {
+  'name': 'Site Isolation Linux',
+  'factory': annotator_factory.AnnotatorFactory().BaseFactory('chromium'),
+  'category': 'site_isolation',
+  'auto_reboot': True,
+}
+
+b_chromium_site_isolation_win = {
+  'name': 'Site Isolation Win',
+  'factory': annotator_factory.AnnotatorFactory().BaseFactory('chromium'),
+  'category': 'site_isolation',
+  'auto_reboot': True,
+}
+
 def windows_browser_drmemory_light_tester(shard, total):
   if shard < 1 or shard > total:
     raise
@@ -2016,6 +2030,10 @@ c['builders'] = [
 
   # OpenSSL
   b_chromium_openssl_mac,
+
+  # Site Isolation
+  b_chromium_site_isolation_linux,
+  b_chromium_site_isolation_win,
 ]
 
 # DrMemory test bots