Add LOCAL_LICENSE_KINDS to external/skia

Bug: b/68860345
Bug: b/151177513
Bug: b/151953481

ag/Iead63ec340208211058d0a04ed4e476af6cd51b0 added these to Android.bp,
resulting in merge conflicts. After that is reverted, we can land these
here unchanged to get the same effect, without conflicts.

Change-Id: Ia9e3970564dca014e4f144fba9e3da4f0c174e7d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/357277
Commit-Queue: Leon Scroggins <scroggo@google.com>
Reviewed-by: Derek Sollenberger <djsollen@google.com>

gn/gn_to_bp.py

@@ -25,6 +25,53 @@ bp = string.Template('''// This file is autogenerated by gn_to_bp.py.
 // files it uses) and submit. The autoroller will then create the updated
 // Android.bp. Or ask a Skia engineer for help.
 
+package {
+    default_applicable_licenses: ["external_skia_license"],
+}
+
+// Added automatically by a large-scale-change that took the approach of
+// 'apply every license found to every target'. While this makes sure we respect
+// every license restriction, it may not be entirely correct.
+//
+// e.g. GPL in an MIT project might only apply to the contrib/ directory.
+//
+// Please consider splitting the single license below into multiple licenses,
+// taking care not to lose any license_kind information, and overriding the
+// default license using the 'licenses: [...]' property on targets as needed.
+//
+// For unused files, consider creating a 'fileGroup' with "//visibility:private"
+// to attach the license to, and including a comment whether the files may be
+// used in the current project.
+//
+// large-scale-change included anything that looked like it might be a license
+// text as a license_text. e.g. LICENSE, NOTICE, COPYING etc.
+//
+// Please consider removing redundant or irrelevant files from 'license_text:'.
+//
+// large-scale-change filtered out the below license kinds as false-positives:
+//   SPDX-license-identifier-CC-BY-NC
+//   SPDX-license-identifier-GPL-2.0
+//   SPDX-license-identifier-LGPL-2.1
+//   SPDX-license-identifier-OFL:by_exception_only
+// See: http://go/android-license-faq
+license {
+    name: "external_skia_license",
+    visibility: [":__subpackages__"],
+    license_kinds: [
+        "SPDX-license-identifier-Apache-2.0",
+        "SPDX-license-identifier-BSD",
+        "SPDX-license-identifier-CC0-1.0",
+        "SPDX-license-identifier-FTL",
+        "SPDX-license-identifier-MIT",
+        "SPDX-license-identifier-MPL",
+        "legacy_unencumbered",
+    ],
+    license_text: [
+        "LICENSE",
+        "NOTICE",
+    ],
+}
+
 cc_defaults {
     name: "skia_defaults",
     cflags: [