feat(dart/transform): Generate ChangeDetector classes

Use the `ProtoViewDto` created by the render `Compiler` to create a
`ChangeDetectorDefinition`.

From there, generate a subclass of `AbstractChangeDetector` for each
`ChangeDetectorDefinition`.

Run some basic unit tests for the dynamic and JIT change detectors on
pre-generated change detectors.

modules/angular2/src/change_detection/change_detection_jit_generator.ts

@@ -27,6 +27,10 @@ import {
  * The code generator takes a list of proto records and creates a function/class
  * that "emulates" what the developer would write by hand to implement the same
  * kind of behaviour.
+ *
+ * This code should be kept in sync with the Dart transformer's
+ * `angular2.transform.template_compiler.change_detector_codegen` library. If you make updates
+ * here, please make equivalent changes there.
 */
 var ABSTRACT_CHANGE_DETECTOR = "AbstractChangeDetector";
 var UTIL = "ChangeDetectionUtil";

modules/angular2/src/change_detection/pregen_proto_change_detector.dart

@@ -0,0 +1,65 @@
+library angular2.src.change_detection.pregen_proto_change_detector;
+
+import 'package:angular2/src/change_detection/coalesce.dart';
+import 'package:angular2/src/change_detection/directive_record.dart';
+import 'package:angular2/src/change_detection/interfaces.dart';
+import 'package:angular2/src/change_detection/pipes/pipe_registry.dart';
+import 'package:angular2/src/change_detection/proto_change_detector.dart';
+import 'package:angular2/src/change_detection/proto_record.dart';
+
+export 'dart:core' show List;
+export 'package:angular2/src/change_detection/abstract_change_detector.dart'
+    show AbstractChangeDetector;
+export 'package:angular2/src/change_detection/directive_record.dart'
+    show DirectiveIndex, DirectiveRecord;
+export 'package:angular2/src/change_detection/interfaces.dart'
+    show ChangeDetector, ChangeDetectorDefinition, ProtoChangeDetector;
+export 'package:angular2/src/change_detection/pipes/pipe_registry.dart'
+    show PipeRegistry;
+export 'package:angular2/src/change_detection/proto_record.dart'
+    show ProtoRecord;
+export 'package:angular2/src/change_detection/change_detection_util.dart'
+    show ChangeDetectionUtil;
+export 'package:angular2/src/facade/lang.dart' show looseIdentical;
+
+typedef ChangeDetector InstantiateMethod(dynamic dispatcher,
+    PipeRegistry registry, List<ProtoRecord> protoRecords,
+    List<DirectiveRecord> directiveRecords);
+
+/// Implementation of [ProtoChangeDetector] for use by pre-generated change
+/// detectors in Angular 2 Dart.
+/// Classes generated by the `TemplateCompiler` use this. The `export`s above
+/// allow the generated code to `import` a single library and get all
+/// dependencies.
+class PregenProtoChangeDetector extends ProtoChangeDetector {
+  /// The [ChangeDetectorDefinition#id]. Strictly informational.
+  final String id;
+
+  /// Closure used to generate an actual [ChangeDetector].
+  final InstantiateMethod _instantiateMethod;
+
+  // [ChangeDetector] dependencies.
+  final PipeRegistry _pipeRegistry;
+  final List<ProtoRecord> _protoRecords;
+  final List<DirectiveRecord> _directiveRecords;
+
+  /// Internal ctor.
+  PregenProtoChangeDetector._(this.id, this._instantiateMethod,
+      this._pipeRegistry, this._protoRecords, this._directiveRecords);
+
+  factory PregenProtoChangeDetector(InstantiateMethod instantiateMethod,
+      PipeRegistry registry, ChangeDetectorDefinition def) {
+    // TODO(kegluneq): Pre-generate these (#2067).
+    var recordBuilder = new ProtoRecordBuilder();
+    def.bindingRecords.forEach((b) {
+      recordBuilder.add(b, def.variableNames);
+    });
+    var protoRecords = coalesce(recordBuilder.records);
+    return new PregenProtoChangeDetector._(def.id, instantiateMethod, registry,
+        protoRecords, def.directiveRecords);
+  }
+
+  @override
+  instantiate(dynamic dispatcher) => _instantiateMethod(
+      dispatcher, _pipeRegistry, _protoRecords, _directiveRecords);
+}