Move tools to tool folder.

pkg/front_end/lib/src/fasta/get_dependencies.dart

+// Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+library fasta.get_dependencies;
+
+import 'dart:async' show Future;
+
+import 'package:kernel/kernel.dart' show loadProgramFromBytes;
+
+import 'package:kernel/target/targets.dart' show Target;
+
+import '../../compiler_options.dart' show CompilerOptions;
+
+import '../../file_system.dart' show FileSystem;
+
+import '../base/processed_options.dart' show ProcessedOptions;
+
+import 'compiler_context.dart' show CompilerContext;
+
+import 'dill/dill_target.dart' show DillTarget;
+
+import 'kernel/kernel_target.dart' show KernelTarget;
+
+import 'uri_translator.dart' show UriTranslator;
+
+// TODO(sigmund): reimplement this API using the directive listener intead.
+Future<List<Uri>> getDependencies(Uri script,
+    {Uri sdk,
+    Uri packages,
+    Uri platform,
+    bool verbose: false,
+    Target target}) async {
+  var options = new CompilerOptions()
+    ..target = target
+    ..verbose = verbose
+    ..packagesFileUri = packages
+    ..sdkSummary = platform
+    ..sdkRoot = sdk;
+  var pOptions = new ProcessedOptions(options);
+  return await CompilerContext.runWithOptions(pOptions,
+      (CompilerContext c) async {
+    FileSystem fileSystem = c.options.fileSystem;
+    UriTranslator uriTranslator = await c.options.getUriTranslator();
+    c.options.ticker.logMs("Read packages file");
+    DillTarget dillTarget =
+        new DillTarget(c.options.ticker, uriTranslator, c.options.target);
+    if (platform != null) {
+      var bytes = await fileSystem.entityForUri(platform).readAsBytes();
+      var platformProgram = loadProgramFromBytes(bytes);
+      platformProgram.unbindCanonicalNames();
+      dillTarget.loader.appendLibraries(platformProgram);
+    }
+    KernelTarget kernelTarget = new KernelTarget(
+        fileSystem, false, dillTarget, uriTranslator, c.uriToSource);
+
+    kernelTarget.read(script);
+    await dillTarget.buildOutlines();
+    await kernelTarget.loader.buildOutlines();
+    return await kernelTarget.loader.getDependencies();
+  });
+}