Make iOS try jobs run by default

PRESUBMIT.py

Index: PRESUBMIT.py
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index 55e56d80a78d6af13ab788e31f4c0a20bac4ce41..9b99aa5caab594c335c24113b7c79c306716f370 100644
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -609,9 +609,12 @@ def GetPreferredTrySlaves(project, change):
     return ['android_dbg']
   if all(re.search('^native_client_sdk', f) for f in files):
     return ['linux_nacl_sdk', 'win_nacl_sdk', 'mac_nacl_sdk']
+  if all(re.search('[/_]ios[/_.]', f) for f in files):
+    return ['ios_rel_device', 'ios_dbg_simulator']
 
   trybots = ['win_rel', 'linux_rel', 'mac_rel', 'linux_clang:compile',
-             'linux_chromeos', 'android_dbg', 'linux_asan', 'mac_asan']
+             'linux_chromeos', 'android_dbg', 'linux_asan', 'mac_asan',
+             'ios_rel_device', 'ios_dbg_simulator']
 
   # Match things like path/aura/file.cc and path/file_aura.cc.
   # Same for ash and chromeos.