Roll gn to c97a86a72105f3328a540f5a5ab17d11989ab7dd (#161012)

The current version is more than 3 years old.

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [ ] I listed at least one issue that this PR fixes in the description
above.
- [ ] I updated/added relevant documentation (doc comments with `///`).
- [ ] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [ ] All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel
on [Discord].

<!-- Links -->
[Contributor Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview
[Tree Hygiene]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md
[test-exempt]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests
[Flutter Style Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md
[Features we expect every widget to implement]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement
[CLA]: https://cla.developers.google.com/
[flutter/tests]: https://github.com/flutter/tests
[breaking change policy]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes
[Discord]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md
[Data Driven Fixes]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md

DEPS

@@ -644,7 +644,7 @@ deps = {
     'packages': [
       {
         'package': 'gn/gn/${{platform}}',
-        'version': 'git_revision:b79031308cc878488202beb99883ec1f2efd9a6d'
+        'version': 'git_revision:c97a86a72105f3328a540f5a5ab17d11989ab7dd'
       },
     ],
     'dep_type': 'cipd',

engine/src/flutter/shell/gpu/BUILD.gn

@@ -114,10 +114,9 @@ if (is_mac) {
     ]
 
     deps = [
-             "//flutter/testing",
              ":gpu_surface_metal",
-             "//flutter/impeller/fixtures",
              "//flutter/fml",
+             "//flutter/impeller/fixtures",
              "//flutter/runtime",
              "//flutter/runtime:libdart",
              "//flutter/testing",

engine/src/flutter/shell/platform/fuchsia/flutter/BUILD.gn

@@ -520,11 +520,11 @@ if (enable_unittests) {
     ]
 
     deps = [
-             "tests/fakes",
              ":flutter_runner_fixtures",
              ":flutter_runner_sources",
              "${fuchsia_sdk}/pkg/async-testing",
              "${fuchsia_sdk}/pkg/sys_cpp_testing",
+             "tests/fakes",
              "//flutter/shell/platform/common/client_wrapper:client_wrapper_library_stubs",
              "//flutter/testing",
            ] + flutter_deps

engine/src/flutter/shell/platform/fuchsia/runtime/dart/utils/BUILD.gn

@@ -44,8 +44,8 @@ template("make_utils") {
              "${fuchsia_sdk}/pkg/async-loop-cpp",
              "${fuchsia_sdk}/pkg/async-loop-default",
              "${fuchsia_sdk}/pkg/fdio",
-             "${fuchsia_sdk}/pkg/sys_cpp",
              "${fuchsia_sdk}/pkg/inspect_component_cpp",
+             "${fuchsia_sdk}/pkg/sys_cpp",
              "${fuchsia_sdk}/pkg/trace",
              "${fuchsia_sdk}/pkg/vfs_cpp",
              "${fuchsia_sdk}/pkg/zx",

engine/src/flutter/shell/platform/linux/BUILD.gn

@@ -80,12 +80,12 @@ source_set("flutter_linux_sources") {
              "fl_binary_messenger_private.h",
              "fl_dart_project_private.h",
              "fl_engine_private.h",
-             "fl_keyboard_handler.h",
-             "fl_keyboard_manager.h",
-             "fl_key_event.h",
              "fl_key_channel_responder.h",
              "fl_key_embedder_responder.h",
              "fl_key_embedder_responder_private.h",
+             "fl_key_event.h",
+             "fl_keyboard_handler.h",
+             "fl_keyboard_manager.h",
              "fl_method_call_private.h",
              "fl_method_channel_private.h",
              "fl_method_codec_private.h",