Bump to Dart SDK 1.23.0-dev.10 (#9051)

* Bump to Dart SDK 1.23.0-dev.10

* allows us to understand flutter usage via telemetry
* brings in `@immutable`

Fixes: #9042

* completer fix

* Update to platform 1.1.1.

bin/internal/dart-sdk.version

-1.23.0-dev.9.0
+1.23.0-dev.10.0

examples/flutter_gallery/test/smoke_test.dart

@@ -14,7 +14,7 @@ import 'package:flutter_gallery/gallery/app.dart' show GalleryApp;
 const String kCaption = 'Flutter Gallery';
 
 final List<String> demoCategories = new LinkedHashSet<String>.from(
-  kAllGalleryItems.map((GalleryItem item) => item.category)
+  kAllGalleryItems.map<String>((GalleryItem item) => item.category)
 ).toList();
 
 final List<String> routeNames =

packages/flutter/test/rendering/mock_canvas.dart

@@ -334,7 +334,7 @@ class _TestRecordingCanvasPatternMatcher extends Matcher implements PaintPattern
     description.add('Object or closure painting: ');
     return description.addAll(
       '', ', ', '',
-      _predicates.map((_PaintPredicate predicate) => predicate.toString()),
+      _predicates.map<String>((_PaintPredicate predicate) => predicate.toString()),
     );
   }
 
@@ -692,7 +692,7 @@ String _describeInvocation(Invocation call) {
     buffer.write(call.positionalArguments[0].toString());
   } else if (call.isMethod) {
     buffer.write('(');
-    buffer.writeAll(call.positionalArguments.map(_valueName), ', ');
+    buffer.writeAll(call.positionalArguments.map<String>(_valueName), ', ');
     String separator = call.positionalArguments.isEmpty ? '' : ', ';
     call.namedArguments.forEach((Symbol name, Object value) {
       buffer.write(separator);

packages/flutter_tools/lib/src/test/flutter_platform.dart

@@ -222,7 +222,7 @@ class _FlutterPlatform extends PlatformPlugin {
           processObservatoryPort = detectedPort;
         },
         startTimeoutTimer: () {
-          new Future<_InitialResult>.delayed(_kTestStartupTimeout, timeout.complete);
+          new Future<_InitialResult>.delayed(_kTestStartupTimeout).then((_) => timeout.complete());
         },
       );
 

packages/flutter_tools/pubspec.yaml

@@ -21,7 +21,7 @@ dependencies:
   meta: ^1.0.4
   mustache: ^0.2.5
   package_config: '>=0.1.5 <2.0.0'
-  platform: 1.1.0
+  platform: 1.1.1
   process: 2.0.1
   stack_trace: ^1.4.0
   usage: ^3.0.0+1