Introduce a layering in the invalidation component as public and impl

chrome/chrome_tests_unit.gypi

 # Copyright 2012 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.
 {
   'variables': {
     'chrome_unit_tests_sources': [
       # histograms.xml is analyzed by AboutFlagsHistogramTest, so this
       # dependency is needed to make commit bots run unit_tests on
       # histograms.xml changes.
       '../tools/metrics/histograms/histograms.xml',
@@ skipping 1642 matching lines @@
         'chrome_resources.gyp:chrome_resources',
         'chrome_resources.gyp:chrome_strings',
         'chrome_resources.gyp:theme_resources',
         'common',
         '../base/base.gyp:base_prefs_test_support',
         '../base/base.gyp:test_support_base',
         '../components/components.gyp:bookmarks_test_support',
         '../components/components.gyp:gcm_driver_test_support',
         '../components/components.gyp:history_core_test_support',
         '../components/components.gyp:instance_id_test_support',
-        '../components/components.gyp:invalidation',
+        '../components/components.gyp:invalidation_impl',
         '../components/components.gyp:invalidation_test_support',
         '../components/components.gyp:metrics_test_support',
         '../components/components.gyp:omnibox_test_support',
         '../components/components.gyp:password_manager_core_browser_test_support',
         '../components/components.gyp:pref_registry_test_support',
         '../components/components.gyp:rappor_test_support',
         '../components/components.gyp:search_engines_test_support',
         '../components/components.gyp:signin_core_browser_test_support',
         '../components/components.gyp:sync_driver_test_support',
         '../components/components.gyp:update_client_test_support',
@@ skipping 1197 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }