Do not strip architecture suffixes from host local-engine (flutter#115320)

* Do not strip suffices from host local-engine

* suffixes

Author: jmagman

packages/flutter_tools/lib/src/runner/local_engine.dart

@@ -150,8 +150,10 @@ class LocalEngineLocator {
   // Determine the host engine directory associated with the local engine:
   // Strip '_sim_' since there are no host simulator builds.
   String _getHostEngineBasename(String localEngineBasename) {
-    if (localEngineBasename.startsWith('web_') || localEngineBasename.startsWith('wasm_')) {
-      // Don't modify the web local engine's basename.
+    if (localEngineBasename.startsWith('web_') ||
+        localEngineBasename.startsWith('wasm_') ||
+        localEngineBasename.startsWith('host_')) {
+      // Don't modify the web or host local engine's basename.
       return localEngineBasename;
     }
 

packages/flutter_tools/test/general.shard/runner/local_engine_test.dart

@@ -146,6 +146,30 @@ void main() {
     expect(logger.traceText, contains('Local engine source at /arbitrary/engine/src'));
   });
 
+  testWithoutContext('works if local engine is host engine with suffixes', () async {
+    final FileSystem fileSystem = MemoryFileSystem.test();
+    final Directory localEngine = fileSystem
+        .directory('$kArbitraryEngineRoot/src/out/host_debug_unopt_arm64/')
+      ..createSync(recursive: true);
+
+    final BufferLogger logger = BufferLogger.test();
+    final LocalEngineLocator localEngineLocator = LocalEngineLocator(
+      fileSystem: fileSystem,
+      flutterRoot: 'flutter/flutter',
+      logger: logger,
+      userMessages: UserMessages(),
+      platform: FakePlatform(environment: <String, String>{}),
+    );
+
+    expect(
+      await localEngineLocator.findEnginePath(null, localEngine.path, null),
+      matchesEngineBuildPaths(
+        hostEngine: '/arbitrary/engine/src/out/host_debug_unopt_arm64',
+        targetEngine: '/arbitrary/engine/src/out/host_debug_unopt_arm64',
+      ),
+    );
+  });
+
   testWithoutContext('fails if host_debug does not exist', () async {
     final FileSystem fileSystem = MemoryFileSystem.test();
     final Directory localEngine = fileSystem