Move tools to tool folder.

pkg/front_end/tool/_fasta/compile_platform.dart

-// Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2016, 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.
 
-import 'package:front_end/src/fasta/compile_platform.dart' show mainEntryPoint;
+library fasta.compile_platform;
 
-main(List<String> arguments) => mainEntryPoint(arguments);
+import 'dart:async' show Future;
+
+import 'dart:io' show exitCode, File;
+
+import 'package:front_end/src/fasta/compiler_context.dart' show CompilerContext;
+
+import 'package:front_end/src/fasta/deprecated_problems.dart'
+    show deprecated_InputError;
+
+import 'package:front_end/src/fasta/kernel/utils.dart' show writeProgramToFile;
+
+import 'package:front_end/src/fasta/severity.dart' show Severity;
+
+import 'package:front_end/src/kernel_generator_impl.dart'
+    show generateKernelInternal;
+
+import 'command_line.dart' show withGlobalOptions;
+
+const int iterations = const int.fromEnvironment("iterations", defaultValue: 1);
+
+Future main(List<String> arguments) async {
+  for (int i = 0; i < iterations; i++) {
+    if (i > 0) {
+      print("\n");
+    }
+    try {
+      await compilePlatform(arguments);
+    } on deprecated_InputError catch (e) {
+      exitCode = 1;
+      CompilerContext.runWithDefaultOptions(
+          (c) => c.report(deprecated_InputError.toMessage(e), Severity.error));
+      return null;
+    }
+  }
+}
+
+Future compilePlatform(List<String> arguments) async {
+  await withGlobalOptions("compile_platform", arguments, false,
+      (CompilerContext c, List<String> restArguments) {
+    c.options.inputs.add(Uri.parse('dart:core'));
+    // Note: the patchedSdk argument is already stored in c.options.sdkRoot.
+    Uri fullOutput = Uri.base.resolveUri(new Uri.file(restArguments[1]));
+    Uri outlineOutput = Uri.base.resolveUri(new Uri.file(restArguments[2]));
+    return compilePlatformInternal(c, fullOutput, outlineOutput);
+  });
+}
+
+Future compilePlatformInternal(
+    CompilerContext c, Uri fullOutput, Uri outlineOutput) async {
+  if (c.options.strongMode) {
+    print("Note: strong mode support is preliminary and may not work.");
+  }
+  if (c.options.verbose) {
+    print("Generating outline of ${c.options.sdkRoot} into $outlineOutput");
+    print("Compiling ${c.options.sdkRoot} to $fullOutput");
+  }
+
+  var result =
+      await generateKernelInternal(buildSummary: true, buildProgram: true);
+  if (result == null) {
+    // Note: an error should have been reported by now.
+    print('The platform .dill files were not created.');
+    return;
+  }
+  new File.fromUri(outlineOutput).writeAsBytesSync(result.summary);
+  c.options.ticker.logMs("Wrote outline to ${outlineOutput.toFilePath()}");
+  await writeProgramToFile(result.program, fullOutput);
+  c.options.ticker.logMs("Wrote program to ${fullOutput.toFilePath()}");
+}