recipe_engine: change resource API to use repo root

recipe_modules/path/example.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 DEPS = [
   'path',
   'platform',
   'properties',
   'step',
 ]
 
 from recipe_engine.config_types import Path
 
 def RunSteps(api):
   api.path.set_config('example')
 
   api.step('step1', ['/bin/echo', str(api.path['slave_build'].join('foo'))])
 
   # module.resource(...) demo.
   api.step('print resource',
            ['echo', api.path.resource('dir', 'file.py')])
 
-  # module.package_dir() demo.
+  # module.package_repo_resource() demo.
   api.step('print package dir',
-           ['echo', api.path.package_resource('dir', 'file.py')])
+           ['echo', api.path.package_repo_resource('dir', 'file.py')])
 
   # Global dynamic paths (see config.py example for declaration):
   dynamic_path = Path('[BORTS]', 'jerky')
 
   assert 'borts' not in api.path
   api.path['borts'] = api.path['slave_build'].join('borts')
   assert 'borts' in api.path
 
   api.step('borts path', ['/bin/echo', dynamic_path])
 
@@ skipping 24 matching lines @@
 
   # We have support for chromium swarming built in to the engine for some
   # reason. TODO(phajdan.jr) remove it.
   yield (api.test('linux_swarming') +
          api.properties(path_config='swarming') +
          api.path.exists(api.path['slave_build']))
 
   yield (api.test('linux_kitchen') +
          api.properties(path_config='kitchen') +
          api.path.exists(api.path['slave_build']))