tools/sort_sources.py: sort C++ source file names in build files.

tools/yes_no.py

+# Copyright 2015 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 sys
+
+
+def YesNo(prompt):
+  """Prompts with a yes/no question, returns True if yes."""
+  print prompt,
+  sys.stdout.flush()
+  # http://code.activestate.com/recipes/134892/
+  if sys.platform == 'win32':
+    import msvcrt
+    ch = msvcrt.getch()
+  else:
+    import termios
+    import tty
+    fd = sys.stdin.fileno()
+    old_settings = termios.tcgetattr(fd)
+    ch = 'n'
+    try:
+      tty.setraw(sys.stdin.fileno())
+      ch = sys.stdin.read(1)
+    finally:
+      termios.tcsetattr(fd, termios.TCSADRAIN, old_settings)
+  print ch
+  return ch in ('Y', 'y')