Change gae to apache 2 license.

PRESUBMIT.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.
+# Copyright 2015 The LUCI Authors. All rights reserved.
+# Use of this source code is governed under the Apache License, Version 2.0
+# that can be found in the LICENSE file.
 
 """Top-level presubmit script.
 
 See https://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts for
 details on the presubmit API built into depot_tools.
 """
 
 import os
 import sys
 
@@ skipping 33 matching lines @@
       message=error_type),
   ])
 
 
 def header(input_api):
   """Returns the expected license header regexp for this project."""
   current_year = int(input_api.time.strftime('%Y'))
   allowed_years = (str(s) for s in reversed(xrange(2011, current_year + 1)))
   years_re = '(' + '|'.join(allowed_years) + ')'
   license_header = (
-    r'.*? Copyright %(year)s The Chromium Authors\. '
-    r'All rights reserved\.\n'
-    r'.*? Use of this source code is governed by a BSD-style license '
-    r'that can be\n'
-    r'.*? found in the LICENSE file\.(?: \*/)?\n'
+    r'.*? Copyright %(year)s The LUCI Authors\. '
+      r'All rights reserved\.\n'
+    r'.*? Use of this source code is governed under the Apache License, '
+      r'Version 2\.0\n'
+    r'.*? that can be found in the LICENSE file\.(?: \*/)?\n'
   ) % {
     'year': years_re,
   }
   return license_header
 
 
 def source_file_filter(input_api):
   """Returns filter that selects source code files only."""
   bl = list(input_api.DEFAULT_BLACK_LIST) + [
     r'.+\.pb\.go$',
@@ skipping 28 matching lines @@
   results = CommonChecks(input_api, output_api)
   results.extend(input_api.canned_checks.CheckChangeHasDescription(
       input_api, output_api))
   results.extend(input_api.canned_checks.CheckDoNotSubmitInDescription(
       input_api, output_api))
   results.extend(input_api.canned_checks.CheckDoNotSubmitInFiles(
       input_api, output_api))
   results.extend(PreCommitGo(
       input_api, output_api, ['lint', 'pre-commit', 'pre-push']))
   return results