build: Introduce Bazel build rules

So far this just compiles the core and common packages.

packages/core/src/linker/system_js_ng_module_factory_loader.ts

@@ -16,6 +16,7 @@ import {NgModuleFactoryLoader} from './ng_module_factory_loader';
 const _SEPARATOR = '#';
 
 const FACTORY_CLASS_SUFFIX = 'NgFactory';
+declare var System: any;
 
 /**
  * Configuration for SystemJsNgModuleLoader.

packages/core/src/util.ts

@@ -6,6 +6,10 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
+// Import zero symbols from zone.js. This causes the zone ambient type to be
+// added to the type-checker, without emitting any runtime module load statement
+import {} from 'zone.js';
+
 // TODO(jteplitz602): Load WorkerGlobalScope from lib.webworker.d.ts file #3492
 declare var WorkerGlobalScope: any /** TODO #9100 */;
 // CommonJS / Node have global context exposed as "global" variable.

packages/core/src/zone/ng_zone.ts

@@ -6,6 +6,9 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
+// Import zero symbols from zone.js. This causes the zone ambient type to be
+// added to the type-checker, without emitting any runtime module load statement
+import {} from 'zone.js';
 import {EventEmitter} from '../event_emitter';
 
 /**