Use MSVS2015 for the fyi PGO builds

scripts/slave/recipe_modules/chromium/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 pipes
 
 from recipe_engine.config import config_item_context, ConfigGroup
 from recipe_engine.config import Dict, List, Single, Static, Set, BadConf
 from recipe_engine.config_types import Path
 
@@ skipping 237 matching lines @@
 
 @config_ctx()
 def msvs2012(c):
   c.gyp_env.GYP_MSVS_VERSION = '2012'
 
 @config_ctx()
 def msvs2013(c):
   c.gyp_env.GYP_MSVS_VERSION = '2013'
 
 @config_ctx()
+def msvs2015(c):
+  c.gyp_env.GYP_MSVS_VERSION = '2015'
+
+@config_ctx()
 def goma_canary(c):
   c.compile_py.goma_hermetic = 'error'
 
 @config_ctx()
 def goma_staging(c):
   c.env.GOMA_STUBBY_PROXY_IP_ADDRESS = 'sandbox.google.com'
 
 @config_ctx()
 def goma_hermetic_fallback(c):
   c.compile_py.goma_hermetic = 'fallback'
@@ skipping 541 matching lines @@
     c.compile_py.goma_dir = None
     c.gyp_env.GYP_DEFINES['use_goma'] = 0
 
 @config_ctx()
 def chromium_deterministic_build(c):
   c.gyp_env.GYP_DEFINES['dont_embed_build_metadata'] = 1
 
 @config_ctx(includes=['chromium_clang'])
 def cast_linux(c):
   c.gyp_env.GYP_DEFINES['chromecast'] = 1