Add copyright headers to remaining gyp files.

gyp/debugger.gyp

+# Copyright 2015 Google Inc.
+#
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
 {
   'variables': {
     'skia_warnings_as_errors': 0,
     'conditions': [
       [ 'skia_os in ["linux", "freebsd", "openbsd", "solaris", "chromeos"]', {
         # Use the systemwide Qt libs by default
         'variables': {
           'qt_sdk%': '/usr',
         },
         'qt_sdk': '<(qt_sdk)',
@@ skipping 173 matching lines @@
                           '<(RULE_INPUT_PATH)',
                           '-o', '<(moc_gen_dir)/moc_<(RULE_INPUT_ROOT).cpp' ],
               'message': 'Generating <(RULE_INPUT_ROOT).cpp.',
             },
           ],
         },
       ],
     }],
   ],
 }