Refactor chromium.perf recipe configs.

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 200 matching lines @@
 
 @config_ctx(includes=['main_builder'])
 def non_device_wipe_provisioning(c):
   c.chrome_specific_wipe = True
 
 @config_ctx(includes=['main_builder'])
 def incremental_coverage_builder_tests(c):
   c.incremental_coverage = True
 
 @config_ctx()
-def perf(c):
+def chromium_perf(c):
   pass
 
 @config_ctx()
 def cast_builder(c):
   pass
 
 @config_ctx(includes=['x86_builder'])
 def gce_builder(c):
   c.gce_setup = True
   c.gce_snapshot = 'clean-22-l-phone-snapshot'
   c.gce_count = 6