feat(testability): Expose function getAllAngularTestabilities

modules/angular2/globals.d.ts

@@ -26,6 +26,7 @@ interface BrowserNodeGlobal {
   Reflect: any;
   zone: Zone;
   getAngularTestability: Function;
+  getAllAngularTestabilities: Function;
   setTimeout: Function;
   clearTimeout: Function;
   setInterval: Function;

modules/angular2/src/core/testability/get_testability.dart

@@ -86,5 +86,11 @@ class GetTestability {
       Testability testability = registry.findTestabilityInTree(elem);
       return _jsify(new PublicTestability(testability));
     });
+    js.context['getAllAngularTestabilities'] = _jsify(() {
+      List<Testability> testabilities = registry.getAllTestabilities();
+      List<PublicTestability> publicTestabilities = 
+        testabilities.map((testability) => new PublicTestability(testability));
+      return _jsify(publicTestabilities);
+    });
   }
 }

modules/angular2/src/core/testability/get_testability.ts

@@ -23,5 +23,9 @@ export class GetTestability {
       }
       return new PublicTestability(testability);
     };
+    global.getAllAngularTestabilities = function(): List<PublicTestability> {
+      var testabilities = registry.getAllTestabilities();
+      return testabilities.map((testability) => { return new PublicTestability(testability); });
+    };
   }
 }

modules/angular2/src/core/testability/testability.ts

@@ -82,6 +82,8 @@ export class TestabilityRegistry {
     this._applications.set(token, testability);
   }
 
+  getAllTestabilities(): List<Testability> { return MapWrapper.values(this._applications); }
+
   findTestabilityInTree(elem: Node): Testability {
     if (elem == null) {
       return null;