Move tools to tool folder.

tools/patch_sdk.dart

 #!/usr/bin/env dart
 // Copyright (c) 2015, 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.
 
 /// Command line tool to merge the SDK libraries and our patch files.
 /// This is currently designed as an offline tool, but we could automate it.
 
 import 'dart:io';
 import 'dart:isolate' show RawReceivePort;
 import 'dart:async';
 import 'dart:math' as math;
 import 'dart:convert' show JSON;
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:path/path.dart' as path;
 
 import 'package:front_end/front_end.dart';
+
+import 'package:front_end/physical_file_system.dart' show PhysicalFileSystem;
+
 import 'package:front_end/src/base/processed_options.dart';
 import 'package:front_end/src/kernel_generator_impl.dart';
 import 'package:front_end/src/fasta/util/relativize.dart' show relativizeUri;
 
-import 'package:front_end/src/fasta/fasta.dart' as fasta show getDependencies;
+import 'package:front_end/src/fasta/get_dependencies.dart' show getDependencies;
 import 'package:front_end/src/fasta/kernel/utils.dart' show writeProgramToFile;
 
 import 'package:kernel/target/targets.dart';
 import 'package:kernel/target/vm_fasta.dart';
 import 'package:kernel/target/flutter_fasta.dart';
 import 'package:compiler/src/kernel/dart2js_target.dart' show Dart2jsTarget;
 
 /// Set of input files that were read by this script to generate patched SDK.
 /// We will dump it out into the depfile for ninja to use.
 ///
@@ skipping 164 matching lines @@
   //    [platformForDeps] is always the VM-specific `platform.dill` file.
   var platformForDeps = platform;
   var sdkDir = outDirUri;
   if (forDart2js || forFlutter) {
     // Note: this would fail if `../patched_sdk/platform.dill` doesn't exist. We
     // added an explicit dependency in the .GN rules so patched_dart2js_sdk (and
     // patched_flutter_sdk) depend on patched_sdk to ensure that it exists.
     platformForDeps = outDirUri.resolve('../patched_sdk/platform.dill');
     sdkDir = outDirUri.resolve('../patched_sdk/');
   }
-  deps.addAll(await fasta.getDependencies(Platform.script,
+  deps.addAll(await getDependencies(
+      Platform.script, PhysicalFileSystem.instance,
       sdk: sdkDir, packages: packages, platform: platformForDeps));
   await writeDepsFile(platformFinalLocation,
       Uri.base.resolveUri(new Uri.file("$outDir.d")), deps);
   await new File.fromUri(platform).rename(platformFinalLocation.toFilePath());
 }
 
 /// Generates an outline.dill and platform.dill file containing the result of
 /// compiling a platform's SDK.
 ///
 /// Returns a list of dependencies read by the compiler. This list can be used
@@ skipping 601 matching lines @@
   var libraryBuilder = new SdkLibrariesReader_LibraryBuilder(forDart2js);
   parseCompilationUnit(contents).accept(libraryBuilder);
   return libraryBuilder.librariesMap.sdkLibraries;
 }
 
 void addLocation(Map<String, Map<String, String>> locations, String libraryName,
     String libraryPath) {
   assert(locations[libraryName] == null);
   locations[libraryName] = {'uri': '${path.toUri(libraryPath)}'};
 }