Adding optional variable 32 bit linux builder

masters/master.tryserver.chromium.linux/slaves.cfg

Index: masters/master.tryserver.chromium.linux/slaves.cfg
diff --git a/masters/master.tryserver.chromium.linux/slaves.cfg b/masters/master.tryserver.chromium.linux/slaves.cfg
index 356bce6f42f3b8f688b7df5cd34dfb235d007bc0..d601e2efb796cd94089c733ea2a3c12258026b8b 100644
--- a/masters/master.tryserver.chromium.linux/slaves.cfg
+++ b/masters/master.tryserver.chromium.linux/slaves.cfg
@@ -67,6 +67,11 @@ def linux():
     'linux_valgrind',
   ]
 
+  optional_32_slaves = [897]
+  optional_32_builders = [
+    'linux_chromium_variable_32',
+  ]
+
   # Set up normal slaves.
   result = []
   for i, slave in enumerate(cq_slaves):
@@ -101,6 +106,18 @@ def linux():
       'pool': 'linux_chromium_cfi_rel_ng',
     })
 
+  result.extend(
+    {
+      'master': 'TryServerChromiumLinux',
+      'os': 'linux',
+      'version': 'precise',
+      'bits': '32',
+      'builder': optional_32_builders,
+      'hostname': 'vm%d-m4' % i,
+      'pool': 'linux_optional_32',
+    } for i in optional_32_slaves
+  )
+
   linux_full_bisect_builder_slaves = [747, 748]
   result.extend(
     {
@@ -116,7 +133,7 @@ def linux():
 
   linux_32_slaves = [117, 162, 163, 188, 193, 196, 198, 201, 203,
                      211, 227, 260, 338, 786, 787, 788, 804, 822,
-                     824, 825, 826, 827, 828, 897]
+                     824, 825, 826, 827, 828]
   result.extend(
     {
       'master': 'TryServerChromiumLinux',