[Android] Switch the x86, x64, and mips builders on chromium.android to mb.

scripts/slave/recipe_modules/chromium_android/config.py

 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import types
 
 from recipe_engine.config import config_item_context, ConfigGroup
 from recipe_engine.config import ConfigList, Dict, List, Single, Static
 from recipe_engine.config_types import Path
 
@@ skipping 66 matching lines @@
   pass
 
 @config_ctx()
 def x86_base(c):
   pass
 
 @config_ctx(includes=['x86_base'])
 def x86_builder(c):
   pass
 
+@config_ctx(includes=['x86_builder'])
+def x86_builder_mb(c):
+  pass
+
 @config_ctx()
 def mipsel_base(c):
   pass
 
 @config_ctx(includes=['mipsel_base'])
 def mipsel_builder(c):
   pass
 
+@config_ctx(includes=['mipsel_base'])
+def mipsel_builder_mb(c):
+  pass
+
 @config_ctx(includes=['main_builder'])
 def dartium_builder(c):  # pragma: no cover
   c.get_app_manifest_vars = False
   c.run_tree_truth = False
   if c.deps_dir != 'src/dart':
     c.deps_file = 'DEPS'
   else:
     c.deps_file = 'tools/deps/dartium.deps/DEPS'
   c.managed = True
 
 @config_ctx()
 def arm_l_builder(c):  # pragma: no cover
   pass
 
 @config_ctx()
 def arm_l_builder_lto(c):  # pragma: no cover
   pass
 
 @config_ctx()
 def arm_l_builder_rel(c):  # pragma: no cover
   pass
 
 @config_ctx()
 def x64_base(c):
   pass
 
 @config_ctx(includes=['x64_base'])
-def x64_builder(c):
+def x64_builder_mb(c):
   pass
 
 @config_ctx()
 def arm64_builder(c):
   pass
 
 @config_ctx()
 def arm64_builder_rel(c):  # pragma: no cover
   pass
 
@@ skipping 80 matching lines @@
 
 @config_ctx()
 def cast_builder(c):
   pass
 
 @config_ctx(includes=['x86_builder'])
 def gce_builder(c):
   c.gce_setup = True
   c.gce_snapshot = 'clean-19-l-phone-snapshot'
   c.gce_count = 10