Auto-format Framework (#160545)

This auto-formats all *.dart files in the repository outside of the
`engine` subdirectory and enforces that these files stay formatted with
a presubmit check.

**Reviewers:** Please carefully review all the commits except for the
one titled "formatted". The "formatted" commit was auto-generated by
running `dev/tools/format.sh -a -f`. The other commits were hand-crafted
to prepare the repo for the formatting change. I recommend reviewing the
commits one-by-one via the "Commits" tab and avoiding Github's "Files
changed" tab as it will likely slow down your browser because of the
size of this PR.

---------

Co-authored-by: Kate Lovett <katelovett@google.com>
Co-authored-by: LongCatIsLooong <31859944+LongCatIsLooong@users.noreply.github.com>

examples/texture/lib/main.dart

@@ -15,10 +15,8 @@ class TexturePage extends StatefulWidget {
 class _TexturePageState extends State<TexturePage> {
   static const int textureWidth = 300;
   static const int textureHeight = 300;
-  static const MethodChannel channel =
-      MethodChannel('samples.flutter.io/texture');
-  final Future<int?> textureId =
-      channel.invokeMethod('create', <int>[textureWidth, textureHeight]);
+  static const MethodChannel channel = MethodChannel('samples.flutter.io/texture');
+  final Future<int?> textureId = channel.invokeMethod('create', <int>[textureWidth, textureHeight]);
 
   // Set the color of the texture.
   Future<void> setColor(int r, int g, int b) async {
@@ -67,10 +65,7 @@ class _TexturePageState extends State<TexturePage> {
               child: const Text('Flutter Sky'),
               onPressed: () => setColor(0x02, 0x7d, 0xfd),
             ),
-            OutlinedButton(
-              child: const Text('Red'),
-              onPressed: () => setColor(0xf2, 0x5d, 0x50),
-            ),
+            OutlinedButton(child: const Text('Red'), onPressed: () => setColor(0xf2, 0x5d, 0x50)),
             OutlinedButton(
               child: const Text('Yellow'),
               onPressed: () => setColor(0xff, 0xf2, 0x75),
@@ -79,10 +74,7 @@ class _TexturePageState extends State<TexturePage> {
               child: const Text('Purple'),
               onPressed: () => setColor(0x62, 0x00, 0xee),
             ),
-            OutlinedButton(
-              child: const Text('Green'),
-              onPressed: () => setColor(0x1c, 0xda, 0xc5),
-            ),
+            OutlinedButton(child: const Text('Green'), onPressed: () => setColor(0x1c, 0xda, 0xc5)),
           ],
         ),
       ),

examples/texture/test/texture_test.dart

@@ -7,8 +7,7 @@ import 'package:texture/main.dart' as texture;
 
 void main() {
   testWidgets('Texture smoke test', (WidgetTester tester) async {
-    texture
-        .main(); // builds the app and schedules a frame but doesn't trigger one
+    texture.main(); // builds the app and schedules a frame but doesn't trigger one
     await tester.pump(); // triggers a frame
 
     expect(find.text('Flutter Blue'), findsOneWidget);