feat(core): provide support for relative assets for components

Assets defined for `templateUrl` and `styleUrls` can now be loaded
in relative to where the component file is placed so long as the
`moduleId` is set within the component annotation.

Closes #5634

modules/angular2/test/compiler/url_resolver_spec.ts

@@ -1,4 +1,15 @@
-import {describe, it, expect, beforeEach, ddescribe, iit, xit, el} from 'angular2/testing_internal';
+import {
+  describe,
+  it,
+  expect,
+  beforeEach,
+  ddescribe,
+  iit,
+  xit,
+  el,
+  inject
+} from 'angular2/testing_internal';
+import {IS_DART} from 'angular2/src/facade/lang';
 import {UrlResolver} from 'angular2/src/compiler/url_resolver';
 
 export function main() {
@@ -69,14 +80,50 @@ export function main() {
         expect(resolver.resolve('foo/baz', '/bar')).toEqual('/bar');
         expect(resolver.resolve('foo/baz/', '/bar')).toEqual('/bar');
       });
-    });
 
-    describe('corner and error cases', () => {
-      it('should encode URLs before resolving', () => {
-        expect(resolver.resolve('foo/baz', `<p #p>Hello
-        </p>`))
-            .toEqual('foo/%3Cp%20#p%3EHello%0A%20%20%20%20%20%20%20%20%3C/p%3E');
+      it('should not resolve urls against the baseUrl when the url contains a scheme', () => {
+        resolver = new UrlResolver('my_packages_dir');
+        expect(resolver.resolve("base/", 'package:file')).toEqual('my_packages_dir/file');
+        expect(resolver.resolve("base/", 'http:super_file')).toEqual('http:super_file');
+        expect(resolver.resolve("base/", './mega_file')).toEqual('base/mega_file');
       });
     });
+
+    describe('packages',
+             () => {
+               it('should resolve a url based on the application package', () => {
+                 resolver = new UrlResolver('my_packages_dir');
+                 expect(resolver.resolve(null, 'package:some/dir/file.txt'))
+                     .toEqual('my_packages_dir/some/dir/file.txt');
+                 expect(resolver.resolve(null, 'some/dir/file.txt')).toEqual('some/dir/file.txt');
+               });
+
+               it('should contain a default value of "/packages" when nothing is provided for DART',
+                  inject([UrlResolver], (resolver) => {
+                    if (IS_DART) {
+                      expect(resolver.resolve(null, 'package:file')).toEqual('/packages/file');
+                    }
+                  }));
+
+               it('should contain a default value of "/" when nothing is provided for TS/ESM',
+                  inject([UrlResolver], (resolver) => {
+                    if (!IS_DART) {
+                      expect(resolver.resolve(null, 'package:file')).toEqual('/file');
+                    }
+                  }));
+
+               it('should resolve a package value when present within the baseurl', () => {
+                 resolver = new UrlResolver('/my_special_dir');
+                 expect(resolver.resolve('package:some_dir/', 'matias.html'))
+                     .toEqual('/my_special_dir/some_dir/matias.html');
+               });
+             })
+
+        describe('corner and error cases', () => {
+          it('should encode URLs before resolving', () => {
+            expect(resolver.resolve('foo/baz', `<p #p>Hello
+        </p>`)).toEqual('foo/%3Cp%20#p%3EHello%0A%20%20%20%20%20%20%20%20%3C/p%3E');
+          });
+        });
   });
 }