feat(compiler): An option to disable the ElementProbe.

lib/core/module.dart

@@ -28,6 +28,7 @@ export "package:angular/core_dom/module_internal.dart" show
     BrowserCookies,
     Cache,
     Compiler,
+    CompilerConfig,
     Cookies,
     BoundViewFactory,
     DirectiveMap,

lib/core_dom/compiler_config.dart

@@ -0,0 +1,15 @@
+part of angular.core.dom_internal;
+
+/**
+ * Global configuration options for the Compiler
+ */
+@Injectable()
+class CompilerConfig {
+  /**
+   * True if the compiler should add ElementProbes to the elements.
+   */
+  final bool elementProbeEnabled;
+
+  CompilerConfig() : elementProbeEnabled = true;
+  CompilerConfig.withOptions({this.elementProbeEnabled: true});
+}

lib/core_dom/element_binder.dart

@@ -14,11 +14,11 @@ class TemplateElementBinder extends ElementBinder {
     return _directiveCache = [template];
   }
 
-  TemplateElementBinder(perf, expando, parser, componentFactory,
+  TemplateElementBinder(perf, expando, parser, config, componentFactory,
                         transcludingComponentFactory, shadowDomComponentFactory,
                         this.template, this.templateBinder,
                         onEvents, bindAttrs, childMode)
-      : super(perf, expando, parser, componentFactory,
+      : super(perf, expando, parser, config, componentFactory,
           transcludingComponentFactory, shadowDomComponentFactory,
           null, null, onEvents, bindAttrs, childMode);
 
@@ -45,6 +45,7 @@ class ElementBinder {
   final Profiler _perf;
   final Expando _expando;
   final Parser _parser;
+  final CompilerConfig _config;
 
   // The default component factory
   final ComponentFactory _componentFactory;
@@ -61,7 +62,7 @@ class ElementBinder {
   // Can be either COMPILE_CHILDREN or IGNORE_CHILDREN
   final String childMode;
 
-  ElementBinder(this._perf, this._expando, this._parser,
+  ElementBinder(this._perf, this._expando, this._parser, this._config,
                 this._componentFactory,
                 this._transcludingComponentFactory,
                 this._shadowDomComponentFactory,
@@ -207,7 +208,9 @@ class ElementBinder {
   void _link(nodeInjector, probe, scope, nodeAttrs) {
     _usableDirectiveRefs.forEach((DirectiveRef ref) {
       var directive = nodeInjector.getByKey(ref.typeKey);
-      probe.directives.add(directive);
+      if (probe != null) {
+        probe.directives.add(directive);
+      }
 
       if (ref.annotation is Controller) {
         scope.context[(ref.annotation as Controller).publishAs] = directive;
@@ -295,8 +298,11 @@ class ElementBinder {
         ..bindByKey(VIEW_KEY, toValue: view)
         ..bindByKey(ELEMENT_KEY, toValue: node)
         ..bindByKey(NODE_KEY, toValue: node)
-        ..bindByKey(NODE_ATTRS_KEY, toValue: nodeAttrs)
-        ..bindByKey(ELEMENT_PROBE_KEY, toFactory: (_) => probe);
+        ..bindByKey(NODE_ATTRS_KEY, toValue: nodeAttrs);
+
+    if (_config.elementProbeEnabled) {
+      nodeModule.bindByKey(ELEMENT_PROBE_KEY, toFactory: (_) => probe);
+    }
 
     directiveRefs.forEach((DirectiveRef ref) {
       Directive annotation = ref.annotation;
@@ -316,9 +322,14 @@ class ElementBinder {
     _registerViewFactory(node, parentInjector, nodeModule);
 
     nodeInjector = parentInjector.createChild([nodeModule]);
-    probe = _expando[node] = new ElementProbe(
-        parentInjector.getByKey(ELEMENT_PROBE_KEY), node, nodeInjector, scope);
-    scope.on(ScopeEvent.DESTROY).listen((_) {_expando[node] = null;});
+    if (_config.elementProbeEnabled) {
+      probe = _expando[node] =
+          new ElementProbe(parentInjector.getByKey(ELEMENT_PROBE_KEY),
+                           node, nodeInjector, scope);
+      scope.on(ScopeEvent.DESTROY).listen((_) {
+        _expando[node] = null;
+      });
+    }
 
     _link(nodeInjector, probe, scope, nodeAttrs);
 

lib/core_dom/element_binder_builder.dart

@@ -4,27 +4,30 @@ part of angular.core.dom_internal;
 class ElementBinderFactory {
   final Parser _parser;
   final Profiler _perf;
+  final CompilerConfig _config;
   final Expando _expando;
   final ComponentFactory _componentFactory;
   final TranscludingComponentFactory _transcludingComponentFactory;
   final ShadowDomComponentFactory _shadowDomComponentFactory;
   final ASTParser _astParser;
 
-  ElementBinderFactory(this._parser, this._perf, this._expando, this._componentFactory,
-      this._transcludingComponentFactory, this._shadowDomComponentFactory,
+  ElementBinderFactory(this._parser, this._perf, this._config, this._expando,
+      this._componentFactory,
+      this._transcludingComponentFactory,
+      this._shadowDomComponentFactory,
       this._astParser);
 
   // TODO: Optimize this to re-use a builder.
   ElementBinderBuilder builder(FormatterMap formatters) =>
     new ElementBinderBuilder(this, _astParser, formatters);
 
   ElementBinder binder(ElementBinderBuilder b) =>
-      new ElementBinder(_perf, _expando, _parser, _componentFactory,
+      new ElementBinder(_perf, _expando, _parser, _config, _componentFactory,
           _transcludingComponentFactory, _shadowDomComponentFactory,
           b.component, b.decorators, b.onEvents, b.bindAttrs, b.childMode);
 
   TemplateElementBinder templateBinder(ElementBinderBuilder b, ElementBinder transclude) =>
-      new TemplateElementBinder(_perf, _expando, _parser, _componentFactory,
+      new TemplateElementBinder(_perf, _expando, _parser, _config, _componentFactory,
           _transcludingComponentFactory, _shadowDomComponentFactory,
           b.template, transclude, b.onEvents, b.bindAttrs, b.childMode);
 }

lib/core_dom/module_internal.dart

@@ -27,6 +27,7 @@ part 'view_factory.dart';
 part 'cookies.dart';
 part 'common.dart';
 part 'compiler.dart';
+part 'compiler_config.dart';
 part 'directive.dart';
 part 'directive_map.dart';
 part 'element_binder.dart';
@@ -60,6 +61,7 @@ class CoreDomModule extends Module {
     bind(AttrMustache);
 
     bind(Compiler, toImplementation: TaggingCompiler);
+    bind(CompilerConfig);
 
     bind(ComponentFactory, toImplementation: ShadowDomComponentFactory);
     bind(ShadowDomComponentFactory);

lib/core_dom/shadow_dom_component_factory.dart

@@ -28,8 +28,9 @@ abstract class ComponentFactory {
 @Injectable()
 class ShadowDomComponentFactory implements ComponentFactory {
   final Expando _expando;
+  final CompilerConfig _config;
 
-  ShadowDomComponentFactory(this._expando);
+  ShadowDomComponentFactory(this._expando, this._config);
 
   final Map<_ComponentAssetKey, async.Future<dom.StyleElement>> _styleElementCache = {};
 
@@ -53,7 +54,8 @@ class ShadowDomComponentFactory implements ComponentFactory {
             injector.getByKey(COMPONENT_CSS_REWRITER_KEY),
             _expando,
             baseCss,
-            _styleElementCache);
+            _styleElementCache,
+            _config);
         var controller = componentFactory.call(injector, scope, viewCache, http, templateCache,
             directives);
 
@@ -81,6 +83,7 @@ class _ComponentFactory implements Function {
       _styleElementCache;
   final ComponentCssRewriter componentCssRewriter;
   final WebPlatform platform;
+  final CompilerConfig _config;
 
   dom.ShadowRoot shadowDom;
   Scope shadowScope;
@@ -89,7 +92,7 @@ class _ComponentFactory implements Function {
 
   _ComponentFactory(this.element, this.typeKey, this.component, this.treeSanitizer,
                     this.platform, this.componentCssRewriter, this._expando,
-                    this._baseCss, this._styleElementCache);
+                    this._baseCss, this._styleElementCache, this._config);
 
   dynamic call(Injector injector, Scope scope,
                ViewCache viewCache, Http http, TemplateCache templateCache,
@@ -187,12 +190,21 @@ class _ComponentFactory implements Function {
       ..bindByKey(EVENT_HANDLER_KEY, toImplementation: ShadowRootEventHandler)
       ..bindByKey(SCOPE_KEY, toValue: shadowScope)
       ..bindByKey(TEMPLATE_LOADER_KEY, toValue: templateLoader)
-      ..bindByKey(SHADOW_ROOT_KEY, toValue: shadowDom)
-      ..bindByKey(ELEMENT_PROBE_KEY, toFactory: (_) => probe);
+      ..bindByKey(SHADOW_ROOT_KEY, toValue: shadowDom);
+    if (_config.elementProbeEnabled) {
+      shadowModule.bindByKey(ELEMENT_PROBE_KEY, toFactory: (_) => probe);
+    }
+
     shadowInjector = injector.createChild([shadowModule], name: SHADOW_DOM_INJECTOR_NAME);
-    probe = _expando[shadowDom] = new ElementProbe(
-        injector.getByKey(ELEMENT_PROBE_KEY), shadowDom, shadowInjector, shadowScope);
-    shadowScope.on(ScopeEvent.DESTROY).listen((ScopeEvent) {_expando[shadowDom] = null;});
+
+    if (_config.elementProbeEnabled) {
+      probe = _expando[shadowDom] =
+          new ElementProbe(injector.getByKey(ELEMENT_PROBE_KEY),
+                           shadowDom, shadowInjector, shadowScope);
+      shadowScope.on(ScopeEvent.DESTROY).listen((ScopeEvent) {
+        _expando[shadowDom] = null;
+      });
+    }
     return shadowInjector;
   }
 }

lib/core_dom/transcluding_component_factory.dart

@@ -71,8 +71,9 @@ class ContentPort {
 @Injectable()
 class TranscludingComponentFactory implements ComponentFactory {
   final Expando _expando;
+  final CompilerConfig _config;
 
-  TranscludingComponentFactory(this._expando);
+  TranscludingComponentFactory(this._expando, this._config);
 
   FactoryFn call(dom.Node node, DirectiveRef ref) {
     // CSS is not supported.
@@ -116,8 +117,11 @@ class TranscludingComponentFactory implements ComponentFactory {
           ..bind(ContentPort, toValue: contentPort)
           ..bind(Scope, toValue: shadowScope)
           ..bind(TemplateLoader, toValue: templateLoader)
-          ..bind(dom.ShadowRoot, toValue: new ShadowlessShadowRoot(element))
-          ..bind(ElementProbe, toFactory: (_) => probe);
+          ..bind(dom.ShadowRoot, toValue: new ShadowlessShadowRoot(element));
+
+      if (_config.elementProbeEnabled) {
+       childModule.bind(ElementProbe, toFactory: (_) => probe);
+      }
       childInjector = injector.createChild([childModule], name: SHADOW_DOM_INJECTOR_NAME);
 
       var controller = childInjector.get(ref.type);

test/angular_spec.dart

@@ -115,6 +115,7 @@ main() {
         "angular.core.dom_internal.BoundViewFactory",
         "angular.core.dom_internal.BrowserCookies",
         "angular.core.dom_internal.Compiler",
+        "angular.core.dom_internal.CompilerConfig",
         "angular.core.dom_internal.Cookies",
         "angular.core.dom_internal.DirectiveMap",
         "angular.core.dom_internal.ElementProbe",

test/core_dom/compiler_spec.dart

@@ -9,15 +9,24 @@ forBothCompilers(fn) {
       m.bind(Compiler, toImplementation: WalkingCompiler);
       return m;
     });
-    fn();
+    fn('walking');
   });
 
   describe('tagging compiler', () {
     beforeEachModule((Module m) {
       m.bind(Compiler, toImplementation: TaggingCompiler);
       return m;
     });
-    fn();
+    fn('tagging');
+  });
+
+  describe('tagging compiler with ElementProbe disabled', () {
+    beforeEachModule((Module m) {
+      m.bind(Compiler, toImplementation: TaggingCompiler);
+      m.bind(CompilerConfig, toValue: new CompilerConfig.withOptions(elementProbeEnabled: false));
+      return m;
+    });
+    fn('tagging-no-elementProbe');
   });
 }
 
@@ -31,12 +40,12 @@ forAllCompilersAndComponentFactories(fn) {
 
       return m;
     });
-    fn();
+    fn('transcluding');
   });
 }
 
 void main() {
-  forBothCompilers(() =>
+  forBothCompilers((compilerType) =>
   describe('TranscludingComponentFactory', () {
     TestBed _;
 
@@ -59,7 +68,7 @@ void main() {
     }));
   }));
 
-  forAllCompilersAndComponentFactories(() =>
+  forAllCompilersAndComponentFactories((compilerType) =>
   describe('dte.compiler', () {
     TestBed _;
 
@@ -357,6 +366,8 @@ void main() {
       }));
 
       it('should store ElementProbe with Elements', async(() {
+        if (compilerType == 'tagging-no-elementProbe') return;
+
         _.compile('<div><simple>innerText</simple></div>');
         microLeap();
         _.rootScope.apply();
@@ -368,14 +379,40 @@ void main() {
         var shadowRoot = simpleElement.shadowRoot;
 
         // If there is no shadow root, skip this.
-        if (shadowRoot != null) {
+        if (compilerType != 'transcluding') {
           var shadowProbe = ngProbe(shadowRoot);
           expect(shadowProbe).toBeNotNull();
           expect(shadowProbe.element).toEqual(shadowRoot);
           expect(shadowProbe.parent.element).toEqual(simpleElement);
         }
       }));
 
+      describe('elementProbeEnabled option', () {
+        beforeEachModule((Module m) {
+          m.bind(CompilerConfig, toValue:
+              new CompilerConfig.withOptions(elementProbeEnabled: false));
+        });
+
+        it('should not store ElementProbe with Elements', async(() {
+          _.compile('<div><simple>innerText</simple></div>');
+          microLeap();
+          _.rootScope.apply();
+          var simpleElement = _.rootElement.querySelector('simple');
+          expect(simpleElement).toHaveText('INNER(innerText)');
+
+          expect(() => ngProbe(simpleElement))
+              .toThrow("Could not find a probe for the node 'simple' nor its parents");
+
+          var shadowRoot = simpleElement.shadowRoot;
+
+          // If there is no shadow root, skip this.
+          if (compilerType != 'transcluding') {
+            expect(() => ngProbe(shadowRoot))
+                .toThrow("Could not find a probe for the node 'Instance of 'ShadowRoot'' nor its parents");
+          }
+        }));
+      });
+
       it('should create a simple component', async((VmTurnZone zone) {
         _.rootScope.context['name'] = 'OUTTER';
         var element = _.compile(r'<div>{{name}}:<simple>{{name}}</simple></div>');
@@ -737,6 +774,8 @@ void main() {
         }));
 
         describe('expando memory', () {
+          if (compilerType == 'tagging-no-elementProbe') return;
+
           Expando expando;
 
           beforeEach(inject((Expando _expando) => expando = _expando));