Add copyright headers to remaining gyp files.

gyp/SimpleiOSApp.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.
 {
   'conditions' : [
     [ 'skia_os != "ios"', {
       'error': '<!(set GYP_DEFINES=\"skia_os=\'ios\'\")'
     }],
   ],
   'targets': [
     {
       'target_name': 'SimpleiOSApp',
       'type': 'executable',
@@ skipping 39 matching lines @@
         'INFOPLIST_FILE' : '../experimental/SimpleiOSApp/SimpleiOSApp-Info.plist',
       },
       'xcode_config_file': '../experimental/iOSSampleApp/SkiOSSampleApp-Base.xcconfig',
       'mac_bundle_resources' : [
         '../experimental/SimpleiOSApp/iPad/MainWindow_iPad.xib',
         '../experimental/SimpleiOSApp/iPhone/MainWindow_iPhone.xib',
       ],
     },
   ],
 }