Some minor fixes to the tool_coverage tool. (#36570)

Extracted from https://github.com/flutter/flutter/pull/36205

packages/flutter_tools/tool/tool_coverage.dart

@@ -10,7 +10,7 @@ import 'dart:isolate';
 import 'package:async/async.dart';
 import 'package:coverage/coverage.dart';
 import 'package:flutter_tools/src/context_runner.dart';
-import 'package:path/path.dart' as p;
+import 'package:path/path.dart' as path;
 import 'package:pedantic/pedantic.dart';
 import 'package:stream_channel/isolate_channel.dart';
 import 'package:stream_channel/stream_channel.dart';
@@ -31,7 +31,7 @@ import 'package:flutter_tools/src/test/coverage_collector.dart';
 ///
 /// Example invocation:
 ///
-///    dart tool/tool_coverage.dart.
+///     dart tool/tool_coverage.dart
 Future<void> main(List<String> arguments) async {
   return runInContext(() async {
     final VMPlatform vmPlatform = VMPlatform();
@@ -50,19 +50,19 @@ class VMPlatform extends PlatformPlugin {
     flutterProject: FlutterProject.current(),
   );
   final Map<String, Future<void>> _pending = <String, Future<void>>{};
-  final String precompiledPath = p.join('.dart_tool', 'build', 'generated', 'flutter_tools');
+  final String precompiledPath = path.join('.dart_tool', 'build', 'generated', 'flutter_tools');
 
   @override
-  StreamChannel<void> loadChannel(String path, SuitePlatform platform) =>
+  StreamChannel<void> loadChannel(String codePath, SuitePlatform platform) =>
       throw UnimplementedError();
 
   @override
-  Future<RunnerSuite> load(String path, SuitePlatform platform,
+  Future<RunnerSuite> load(String codePath, SuitePlatform platform,
       SuiteConfiguration suiteConfig, Object message) async {
     final ReceivePort receivePort = ReceivePort();
     Isolate isolate;
     try {
-      isolate = await _spawnIsolate(path, receivePort.sendPort);
+      isolate = await _spawnIsolate(codePath, receivePort.sendPort);
     } catch (error) {
       receivePort.close();
       rethrow;
@@ -71,7 +71,7 @@ class VMPlatform extends PlatformPlugin {
     // When this is completed we remove it from the map of pending so we can
     // log the futures that get "stuck".
     unawaited(completer.future.whenComplete(() {
-      _pending.remove(path);
+      _pending.remove(codePath);
     }));
     final ServiceProtocolInfo info = await Service.controlWebServer(enable: true);
     final dynamic channel = IsolateChannel<Object>.connectReceive(receivePort)
@@ -94,14 +94,14 @@ class VMPlatform extends PlatformPlugin {
 
     VMEnvironment environment;
     final RunnerSuiteController controller = deserializeSuite(
-      path,
+      codePath,
       platform,
       suiteConfig,
       environment,
       channel,
       message,
     );
-    _pending[path] = completer.future;
+    _pending[codePath] = completer.future;
     return await controller.suite;
   }
 
@@ -109,11 +109,11 @@ class VMPlatform extends PlatformPlugin {
   ///
   /// This isolate connects an [IsolateChannel] to [message] and sends the
   /// serialized tests over that channel.
-  Future<Isolate> _spawnIsolate(String path, SendPort message) async {
-    String testPath = p.absolute(p.join(precompiledPath, path) + '.vm_test.dart');
+  Future<Isolate> _spawnIsolate(String codePath, SendPort message) async {
+    String testPath = path.absolute(path.join(precompiledPath, codePath) + '.vm_test.dart');
     testPath = testPath.substring(0, testPath.length - '.dart'.length) + '.vm.app.dill';
-    return await Isolate.spawnUri(p.toUri(testPath), <String>[], message,
-      packageConfig: p.toUri('.packages'),
+    return await Isolate.spawnUri(path.toUri(testPath), <String>[], message,
+      packageConfig: path.toUri('.packages'),
       checked: true,
     );
   }
@@ -126,8 +126,8 @@ class VMPlatform extends PlatformPlugin {
       // TODO(jonahwilliams): resolve whether there are any specific tests that
       // get stuck or if it is a general infra issue with how we are collecting
       // coverage.
-      // Log tests that are "Stuck" waiuting for coverage.
-      print('The folllowing tests timed out waiting for coverage:');
+      // Log tests that are "Stuck" waiting for coverage.
+      print('The following tests timed out waiting for coverage:');
       print(_pending.keys.join(', '));
     }
     final String packagePath = Directory.current.path;
@@ -139,7 +139,7 @@ class VMPlatform extends PlatformPlugin {
       formatter: formatter,
     );
     final String prefix = Platform.environment['SUBSHARD'] ?? '';
-    final String outputLcovPath = p.join('coverage', '$prefix.lcov.info');
+    final String outputLcovPath = path.join('coverage', '$prefix.lcov.info');
     File(outputLcovPath)
       ..createSync(recursive: true)
       ..writeAsStringSync(result);