split_link tool, config, and scripts for windows build

tools/win/split_link/check_installed.py

Index: tools/win/split_link/check_installed.py
diff --git a/tools/win/split_link/check_installed.py b/tools/win/split_link/check_installed.py
new file mode 100644
index 0000000000000000000000000000000000000000..20170211a6624936dc937ee073723d165f6a6ac7
--- /dev/null
+++ b/tools/win/split_link/check_installed.py
@@ -0,0 +1,46 @@
+# Copyright (c) 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 os
+import sys
+
+
+def IsAvailable():
+  _winreg = None
+  if sys.platform == 'win32':
+    import _winreg
+  elif sys.platform == 'cygwin':
+    try:
+      import cygwinreg as _winreg
+    except ImportError:
+      pass  # If not available, be safe and write 0.
+
+  if not _winreg:
+    return False
+
+  try:
+    val = _winreg.QueryValue(_winreg.HKEY_CURRENT_USER,
+                             'Software\\Chromium\\split_link_installed')
+    return os.path.exists(val)
+  except WindowsError:
+    pass
+
+  return False
+
+
+def main():
+  # Can be called from gyp to set variable.
+  if IsAvailable():
+    sys.stdout.write('1')
+  else:
+    print >> sys.stderr, "Couldn't find split_link installation."
+    print >> sys.stderr, ('Run python tools\\win\\split_link\\'
+                          'install_split_link.py from an elevated Visual '
+                          'Studio Command Prompt to install.')
+    sys.stdout.write('0')
+    return 1
+
+
+if __name__ == '__main__':
+  sys.exit(main())