Update floating builder logic, add to "chromiumos"

masters/master.chromiumos/slaves.cfg

Index: masters/master.chromiumos/slaves.cfg
diff --git a/masters/master.chromiumos/slaves.cfg b/masters/master.chromiumos/slaves.cfg
index d3985e2be58f3c08ed910c81915c0bba0756b0bf..260f859df966dc09335bb7b84769c04a7fa86d21 100644
--- a/masters/master.chromiumos/slaves.cfg
+++ b/masters/master.chromiumos/slaves.cfg
@@ -16,7 +16,8 @@ def shared(slave_type):
 
 # Baremetal slaves
 sa.AddPool(SlaveType.BAREMETAL, *('build%s-m2' % (n,) for n in set([
-    85, 86, 87, 92, 112, 162, 174, 182, 203, 257, 263, 323, 326,
+    85, 86, 87, 92, 112, 162, 174, 182, 203, 257, 258, 317, 263, 323, 326,
+    333,
 ]) - set([
   # Decommissioned slaves (please include bug so we can re-include when Fixed).
   91, # crbug.com/606427
@@ -57,6 +58,17 @@ for board_config in chromiumos_board_config.builder_configs.itervalues():
             exclusive=True,
             subtype=name))
 
+  # If the board requires a floating builder, add that.
+  if board_config.floating:
+    sa.Join(
+        name,
+        sa.Alloc(
+            'floating',
+            subtype=board_config.config.category,
+            pools=[board_config.slave_type],
+            count=board_config.floating,
+            exclusive=True))
+
 def GenSlave(hostname, config_names):
   return {
       'master': 'ChromiumOS',