Enable strong mode in DDC, fix all warnings/errors

tool/global_compile.dart

 #!/usr/bin/env dart
 // 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 'dart:async';
 import 'dart:io';
 
 import 'package:analyzer/analyzer.dart'
     show
@@ skipping 84 matching lines @@
     last = completer.future;
   }
 
   // Build modules asynchronously
   var tmpdir = (tmp == null)
       ? Directory.systemTemp
           .createTempSync(outfile.replaceAll(path.separator, '__'))
       : new Directory(tmp)..createSync();
   for (var module in orderedModules) {
     var file = tmpdir.path + path.separator + module + '.js';
-    var command = new List.from(template)..addAll(['-o', file]);
+    var command = template.toList()..addAll(['-o', file]);
     var dependences = transitiveDependenceMap[module];
     for (var dependence in dependences) {
       var summary = tmpdir.path + path.separator + dependence + '.sum';
       command.addAll(['-s', summary]);
     }
     var infiles = fileMap[module];
     command.addAll(infiles);
 
-    var immediateDeps =
-        dependenceMap.containsKey(module) ? dependenceMap[module] : <String>[];
-    var waitList = immediateDeps.map((dep) => readyMap[dep]);
+    var waitList = dependenceMap.containsKey(module)
+        ? dependenceMap[module].map((dep) => readyMap[dep])
+        : <Future>[];
     var future = Future.wait(waitList);
     readyMap[module] = future.then((_) {
       var ready = Process.run(dartPath, command);
       if (log) {
         print(command.join(' '));
       }
       return ready.then((result) {
         if (result.exitCode != 0) {
           print('ERROR: compiling $module');
           print(result.stdout);
@@ skipping 145 matching lines @@
         var uri = _resolveDirective(d);
         processDependence(entryPoint, canonicalize(uri, entryDir));
         transitiveFiles(uri, entryDir, packageRoot);
       } else if (d is PartDirective) {
         var uri = _resolveDirective(d);
         processFile(canonicalize(uri, entryDir));
       }
     }
   }
 }