Support directories other than "web" in pub build.

sdk/lib/_internal/pub/test/build/copies_browser_js_next_to_entrypoints_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:convert';
 
-import 'package:path/path.dart' as path;
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 
 main() {
   initConfig();
 
   integration("compiles dart.js and interop.js next to entrypoints", () {
     // Dart2js can take a long time to compile dart code, so we increase the
@@ skipping 26 matching lines @@
                 d.file('interop.js', 'contents of interop.js')
               ])
             ])
           ])
         ])
       ])
     ]);
 
     d.dir(appPath, [
       d.appPubspec({"browser": "1.0.0"}),
+      d.dir('example', [
+        d.file('file.dart', 'void main() => print("hello");'),
+        d.dir('subdir', [
+          d.file('subfile.dart', 'void main() => print("subhello");')
+        ])
+      ]),
       d.dir('web', [
         d.file('file.dart', 'void main() => print("hello");'),
-        d.dir('subdir', [
+        d.dir('subweb', [
           d.file('subfile.dart', 'void main() => print("subhello");')
         ])
       ])
     ]).create();
 
     pubGet();
 
-    schedulePub(args: ["build"],
-        output: new RegExp(r"Built 12 files!"),
-        exitCode: 0);
+    schedulePub(args: ["build", "--all"],
+        output: new RegExp(r"Built 20 files!"));
 
     d.dir(appPath, [
       d.dir('build', [
-        d.matcherFile('file.dart.js', isNot(isEmpty)),
-        d.matcherFile('file.dart.precompiled.js', isNot(isEmpty)),
-        d.matcherFile('file.dart.js.map', isNot(isEmpty)),
-        d.dir('packages', [d.dir('browser', [
-          d.file('dart.js', 'contents of dart.js'),
-          d.file('interop.js', 'contents of interop.js')
-        ])]),
-        d.dir('subdir', [
+        d.dir('example', [
+          d.matcherFile('file.dart.js', isNot(isEmpty)),
+          d.matcherFile('file.dart.precompiled.js', isNot(isEmpty)),
+          d.matcherFile('file.dart.js.map', isNot(isEmpty)),
           d.dir('packages', [d.dir('browser', [
             d.file('dart.js', 'contents of dart.js'),
             d.file('interop.js', 'contents of interop.js')
           ])]),
-          d.matcherFile('subfile.dart.js', isNot(isEmpty)),
-          d.matcherFile('subfile.dart.precompiled.js', isNot(isEmpty)),
-          d.matcherFile('subfile.dart.js.map', isNot(isEmpty))
+          d.dir('subdir', [
+            d.dir('packages', [d.dir('browser', [
+              d.file('dart.js', 'contents of dart.js'),
+              d.file('interop.js', 'contents of interop.js')
+            ])]),
+            d.matcherFile('subfile.dart.js', isNot(isEmpty)),
+            d.matcherFile('subfile.dart.precompiled.js', isNot(isEmpty)),
+            d.matcherFile('subfile.dart.js.map', isNot(isEmpty))
+          ])
+        ]),
+        d.dir('web', [
+          d.matcherFile('file.dart.js', isNot(isEmpty)),
+          d.matcherFile('file.dart.precompiled.js', isNot(isEmpty)),
+          d.matcherFile('file.dart.js.map', isNot(isEmpty)),
+          d.dir('packages', [d.dir('browser', [
+            d.file('dart.js', 'contents of dart.js'),
+            d.file('interop.js', 'contents of interop.js')
+          ])]),
+          d.dir('subweb', [
+            d.dir('packages', [d.dir('browser', [
+              d.file('dart.js', 'contents of dart.js'),
+              d.file('interop.js', 'contents of interop.js')
+            ])]),
+            d.matcherFile('subfile.dart.js', isNot(isEmpty)),
+            d.matcherFile('subfile.dart.precompiled.js', isNot(isEmpty)),
+            d.matcherFile('subfile.dart.js.map', isNot(isEmpty))
+          ])
         ])
       ])
     ]).validate();
   });
 }