Add Clang ToT builder for iOS

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 90f7ff66bcee3f374e1ec8fd41c6e26d776729b9..d268a152d00c82eecf63a408eac2eb6aeef71923 100644
--- a/masters/master.chromium.fyi/master.cfg
+++ b/masters/master.chromium.fyi/master.cfg
@@ -115,6 +115,7 @@ s_chromium = Scheduler(
                   'ClangToTMac',
                   'ClangToTMac (dbg)',
                   'ClangToTMacASan',
+                  'ClangToTiOS',
                   'CrWinAsan(dll)',  # not (asan/shared) cause crbug.com/399990
                   'Chromium Win x64 Clobber',
                   'Chromium Win PGO Builder',
@@ -1255,6 +1256,15 @@ b_clang_tot_mac_asan_tester = {
   'auto_reboot': True,
 }
 
+b_clang_tot_ios = {
+  'name': 'ClangToTiOS',
+  'factory': annotator_factory.AnnotatorFactory().BaseFactory(
+    'ios/unified_builder_tester'
+  ),
+  'category': 'clang tot',
+  'auto_reboot': False,
+}
+
 b_chromium_win7_shared_vs2013_dbg = {
   'name': 'Cr Win VS2013 (dbg)',
   'factory': f_chromium_win_shared_2013_dbg,
@@ -1871,6 +1881,7 @@ c['builders'] = [
   b_clang_tot_mac_dbg,
   b_clang_tot_mac_asan,
   b_clang_tot_mac_asan_tester,
+  b_clang_tot_ios,
 
   # Control flow integrity.
   b_chromium_cfi_linux,