ninja windows: emulate msvs generator behaviour for msvs_error_on_missing_sources=1

pylib/gyp/generator/ninja.py

 # Copyright (c) 2012 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import copy
 import hashlib
 import multiprocessing
 import os.path
 import re
 import signal
@@ skipping 407 matching lines @@
     # We never need to explicitly depend on previous target's link steps,
     # because no compile ever depends on them.
     compile_depends_stamp = (self.target.actions_stamp or compile_depends)
 
     # Write out the compilation steps, if any.
     link_deps = []
     sources = spec.get('sources', []) + extra_sources
     if sources:
       pch = None
       if self.flavor == 'win':
+        gyp.msvs_emulation.VerifyMissingSources(
+            sources, self.abs_build_dir, generator_flags, self.GypPathToNinja)
         pch = gyp.msvs_emulation.PrecompiledHeader(
             self.msvs_settings, config_name, self.GypPathToNinja)
       else:
         pch = gyp.xcode_emulation.MacPrefixHeader(
             self.xcode_settings, self.GypPathToNinja,
             lambda path, lang: self.GypPathToUniqueOutput(path + '-' + lang))
       link_deps = self.WriteSources(
           config_name, config, sources, compile_depends_stamp, pch,
           case_sensitive_filesystem)
       # Some actions/rules output 'sources' that are already object files.
@@ skipping 1340 matching lines @@
           arglists.append(
               (target_list, target_dicts, data, params, config_name))
           pool.map(CallGenerateOutputForConfig, arglists)
       except KeyboardInterrupt, e:
         pool.terminate()
         raise e
     else:
       for config_name in config_names:
         GenerateOutputForConfig(target_list, target_dicts, data, params,
                                 config_name)