[hooks_runner] No hooks performance trace

pkgs/hooks_runner/lib/src/build_runner/build_planner.dart

@@ -75,19 +75,27 @@ class NativeAssetsBuildPlanner {
   Future<List<Package>> _runPackagesWithHook(Hook hook) async {
     final packageNamesInDependencies = packageGraph.vertices.toSet();
     final result = <Package>[];
+    final watch = Stopwatch()..start();
+    var length = 0;
     for (final package in packageLayout.packageConfig.packages) {
       if (!packageNamesInDependencies.contains(package.name)) {
         continue;
       }
       final packageRoot = package.root;
       if (packageRoot.scheme == 'file') {
+        length++;
         if (await fileSystem
             .file(packageRoot.resolve('hook/').resolve(hook.scriptName))
             .exists()) {
           result.add(package);
         }
       }
     }
+    watch.stop();
+    logger.finest(
+      'Checking $length packages for hook/${hook.scriptName} '
+      'took ${watch.elapsedMilliseconds} ms.',
+    );
     return result;
   }
 

pkgs/hooks_runner/test/build_runner/build_planner_test.dart

@@ -36,6 +36,10 @@ void main() async {
             packageLayout: packageLayout,
             fileSystem: const LocalFileSystem(),
           );
+      final packagesWithHook = await nativeAssetsBuildPlanner.packagesWithHook(
+        Hook.build,
+      );
+      expect(packagesWithHook.length, 1);
       final buildPlan = await nativeAssetsBuildPlanner.makeBuildHookPlan();
       expect(buildPlan.success.length, 1);
       expect(buildPlan.success.single.name, 'native_add');