Add copyright headers to remaining gyp files.

gyp/android_deps.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.
 # This GYP file stores the dependencies necessary to build Skia on the Android
 # platform. The OS doesn't provide many stable libraries as part of the
 # distribution so we have to build a few of them ourselves.
 #
 # We tried adding this gyp file to the android directory at the root of
 # the Skia repo, but that resulted in the generated makefiles being created
 # outside of the intended output directory. So to avoid this we created a simple
 # shim here that includes the android_deps.gypi file.  The actual dependencies
 # are defined and maintained in that gypi file.
 #
@@ skipping 61 matching lines @@
           },
           {
             'target_name': 'cpu_features',
             'type': 'none',
           },
         ],
       }
     ],
   ],
 }