Migrate dartium_tools from chrome branch to dart repo

tools/dartium/update_version.py

+#!/usr/bin/env python
+#
+# Copyright 2012 Google Inc. All Rights Reserved.
+
+import subprocess
+import sys
+
+def FetchSVNRevision():
+  try:
+    proc = subprocess.Popen(['svn', 'info'],
+                            stdout=subprocess.PIPE,
+                            stderr=subprocess.PIPE,
+                            cwd='src/dart',
+                            shell=(sys.platform=='win32'))
+  except OSError:
+    # command is apparently either not installed or not executable.
+    return None
+  if not proc:
+    return None
+
+  for line in proc.stdout:
+    line = line.strip()
+    if not line:
+      continue
+    key, val = line.split(': ', 1)
+    if key == 'Revision':
+      return val
+
+  return None
+
+
+def main():
+  revision = FetchSVNRevision()
+  path = 'src/chrome/VERSION'
+  text = file(path).readlines()
+  text[2] = 'BUILD=d%s\n' % revision
+  file(path, 'w').writelines(text)
+
+if __name__ == '__main__':
+  main()