Read Skia's CQ required steps from the buildbot master.

projects.py

 # Copyright (c) 2012 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.
 """Define the supported projects."""
 
 import json
 import logging
 import os
 import re
 import sys
@@ skipping 494 matching lines @@
     try_server_url = 'http://108.170.217.252:10117/'
     compile_required_build_steps = [
         'BuildBench',
         'BuildGm',
         'BuildMost',
         'BuildSkiaLib',
         'BuildTests',
         'BuildTools',
     ]
 
+    # Get the required build steps and builder names from the try server.
+    compile_required_build_steps = json.load(
+        urllib2.urlopen(
+            try_server_url + 'json/cq_required_steps'))['cq_required_steps']
     builder_names = list(
         json.load(urllib2.urlopen(try_server_url + 'json/cqtrybots')))
 
     step_verifiers = []
     for builder_name in builder_names:
       step_verifiers.append(
           try_job_steps.TryJobSteps(
               builder_name=builder_name,
               steps=compile_required_build_steps))
     verifiers.append(try_job_on_rietveld.TryRunnerRietveld(
@@ skipping 207 matching lines @@
   """List the projects that can be managed by the commit queue."""
   return sorted(
       x[5:] for x in dir(sys.modules[__name__]) if x.startswith('_gen_'))
 
 
 def load_project(project, user, root_dir, rietveld_obj, no_try):
   """Loads the specified project."""
   assert os.path.isabs(root_dir)
   return getattr(sys.modules[__name__], '_gen_' + project)(
       user, root_dir, rietveld_obj, no_try)