feat(dart/transform): Remove unnecessary .ng_deps.dart files

Removes `.ng_deps.dart` files which

1. Do not register any `@Injectable` classes
2. Do not call `initReflector` on any other `.ng_deps.dart` files.

Closes #1929

modules/angular2/src/transform/common/options.dart

@@ -3,9 +3,13 @@ library angular2.transform.common.options;
 import 'annotation_matcher.dart';
 import 'mirror_mode.dart';
 
-const ENTRY_POINT_PARAM = 'entry_points';
-const REFLECTION_ENTRY_POINT_PARAM = 'reflection_entry_points';
+/// See `optimizationPhases` below for an explanation.
+const DEFAULT_OPTIMIZATION_PHASES = 5;
+
 const CUSTOM_ANNOTATIONS_PARAM = 'custom_annotations';
+const ENTRY_POINT_PARAM = 'entry_points';
+const OPTIMIZATION_PHASES_PARAM = 'optimization_phases';
+const REFLECTION_ENTRY_POINT_PARAM = 'reflection_entry_points';
 
 /// Provides information necessary to transform an Angular2 app.
 class TransformerOptions {
@@ -28,20 +32,32 @@ class TransformerOptions {
   /// The [AnnotationMatcher] which is used to identify angular annotations.
   final AnnotationMatcher annotationMatcher;
 
+  /// The number of phases to spend optimizing output size.
+  /// Each additional phase adds time to the transformation but may decrease
+  /// final output size. There is a limit beyond which this will no longer
+  /// decrease size, that is, setting this to 20 may not decrease size any
+  /// more than setting it to 10, but you will still pay an additional
+  /// penalty in transformation time.
+  /// The "correct" number of phases varies with the structure of the app.
+  final int optimizationPhases;
+
   TransformerOptions._internal(this.entryPoints, this.reflectionEntryPoints,
       this.modeName, this.mirrorMode, this.initReflector,
-      this.annotationMatcher);
+      this.annotationMatcher, this.optimizationPhases);
 
   factory TransformerOptions(List<String> entryPoints,
       {List<String> reflectionEntryPoints, String modeName: 'release',
       MirrorMode mirrorMode: MirrorMode.none, bool initReflector: true,
-      List<AnnotationDescriptor> customAnnotationDescriptors: const []}) {
+      List<AnnotationDescriptor> customAnnotationDescriptors: const [],
+      int optimizationPhases: DEFAULT_OPTIMIZATION_PHASES}) {
     if (reflectionEntryPoints == null || reflectionEntryPoints.isEmpty) {
       reflectionEntryPoints = entryPoints;
     }
     var annotationMatcher = new AnnotationMatcher()
       ..addAll(customAnnotationDescriptors);
+    optimizationPhases = optimizationPhases.isNegative ? 0 : optimizationPhases;
     return new TransformerOptions._internal(entryPoints, reflectionEntryPoints,
-        modeName, mirrorMode, initReflector, annotationMatcher);
+        modeName, mirrorMode, initReflector, annotationMatcher,
+        optimizationPhases);
   }
 }

modules/angular2/src/transform/common/options_reader.dart

@@ -26,12 +26,15 @@ TransformerOptions parseBarbackSettings(BarbackSettings settings) {
       mirrorMode = MirrorMode.none;
       break;
   }
+  var optimizationPhases = _readInt(config, OPTIMIZATION_PHASES_PARAM,
+      defaultValue: DEFAULT_OPTIMIZATION_PHASES);
   return new TransformerOptions(entryPoints,
       reflectionEntryPoints: reflectionEntryPoints,
       modeName: settings.mode.name,
       mirrorMode: mirrorMode,
       initReflector: initReflector,
-      customAnnotationDescriptors: _readCustomAnnotations(config));
+      customAnnotationDescriptors: _readCustomAnnotations(config),
+      optimizationPhases: optimizationPhases);
 }
 
 /// Cribbed from the polymer project.
@@ -56,6 +59,18 @@ List<String> _readFileList(Map config, String paramName) {
   return files;
 }
 
+int _readInt(Map config, String paramName, {int defaultValue: null}) {
+  if (!config.containsKey(paramName)) return defaultValue;
+  var value = config[paramName];
+  if (value is String) {
+    value = int.parse(value);
+  }
+  if (value is! int) {
+    throw new ArgumentError.value(value, paramName, 'Expected an integer');
+  }
+  return value;
+}
+
 /// Parse the [CUSTOM_ANNOTATIONS_PARAM] options out of the transformer into
 /// [AnnotationDescriptor]s.
 List<AnnotationDescriptor> _readCustomAnnotations(Map config) {