[perf] Refactor chromium.perf.fyi recipe config to reuse chromium.perf code.

scripts/slave/recipe_modules/chromium_tests/tryserver_chromium_perf.py

 # Copyright 2014 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.
 
 from . import chromium_perf
 
 import DEPS
-CONFIG_CTX = DEPS['gclient'].CONFIG_CTX
+CHROMIUM_CONFIG_CTX = DEPS['chromium'].CONFIG_CTX
+GCLIENT_CONFIG_CTX = DEPS['gclient'].CONFIG_CTX
 
-@CONFIG_CTX(includes=['chromium_perf'])
-def tryserver_chromium_perf(c):
-  soln = c.solutions.add()
-  soln.name = 'catapult'
-  soln.url = ('https://chromium.googlesource.com/external/github.com/'
-              'catapult-project/catapult.git')
 
 SPEC = {
   'builders': {},
   'settings': chromium_perf.SPEC['settings'],
 }
 
 
+@CHROMIUM_CONFIG_CTX(includes=['chromium_perf', 'goma_hermetic_fallback'])
+def tryserver_chromium_perf(c):
+  # Bisects may build using old toolchains, so goma_hermetic_fallback is
+  # required. See https://codereview.chromium.org/1015633002
+  pass
+
+
+@GCLIENT_CONFIG_CTX(includes=['chromium_perf'])
+def tryserver_chromium_perf(c):
+  soln = c.solutions.add()
+  soln.name = 'catapult'
+  soln.url = ('https://chromium.googlesource.com/external/github.com/'
+              'catapult-project/catapult.git')
+
+
 def _AddBuildSpec(name, platform, target_bits=64):
   SPEC['builders'][name] = chromium_perf.BuildSpec(
       'tryserver_chromium_perf', None, platform, target_bits)
 
 
 def _AddTestSpec(name, platform, target_bits=64):
   # TODO(dtu): Change this to TestSpec after try job builds are all offloaded
   # to builders.
   spec = chromium_perf.BuildSpec(
       'tryserver_chromium_perf', None, platform, target_bits)
@@ skipping 25 matching lines @@
 _AddTestSpec('winx64ati_perf_bisect', 'win')
 _AddTestSpec('winx64intel_perf_bisect', 'win')
 _AddTestSpec('winx64nvidia_perf_bisect', 'win')
 
 _AddTestSpec('mac_10_11_perf_bisect', 'mac')
 _AddTestSpec('mac_10_10_perf_bisect', 'mac')
 _AddTestSpec('mac_retina_perf_bisect', 'mac')
 _AddTestSpec('mac_hdd_perf_bisect', 'mac')
 
 _AddTestSpec('linux_perf_bisect', 'linux')