Add the JNI code in order to let Java use the InterestsFetcher.

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',
       # All unittests in browser, common, renderer and service.
       'browser/about_flags_unittest.cc',
       'browser/after_startup_task_utils_unittest.cc',
       'browser/android/bookmarks/partner_bookmarks_shim_unittest.cc',
       'browser/android/contextualsearch/contextual_search_delegate_unittest.cc',
       'browser/android/history_report/delta_file_backend_leveldb_unittest.cc',
       'browser/android/history_report/delta_file_commons_unittest.cc',
       'browser/android/history_report/usage_reports_buffer_backend_unittest.cc',
+      'browser/android/interests_service_unittest.cc',
       # TODO(newt): move this to test_support_unit?
       'browser/android/mock_location_settings.cc',
       'browser/android/mock_location_settings.h',
       'browser/android/most_visited_sites_unittest.cc',
       'browser/android/net/external_estimate_provider_android_unittest.cc',
       'browser/android/preferences/pref_service_bridge_unittest.cc',
       'browser/android/shortcut_info_unittest.cc',
       'browser/android/thumbnail/scoped_ptr_expiring_cache_unittest.cc',
       'browser/app_controller_mac_unittest.mm',
       'browser/autocomplete/autocomplete_provider_unittest.cc',
@@ skipping 2926 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }