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

chrome/chrome_browser.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': {
     # All .cc, .h, .m, and .mm files under browser except for:
     # * tests and mocks.
     # * code below browser/chromeos
     # * code below browser/extensions
@@ skipping 140 matching lines @@
       'browser/android/history_report/usage_report_util.cc',
       'browser/android/history_report/usage_report_util.h',
       'browser/android/history_report/usage_reports_buffer_backend.cc',
       'browser/android/history_report/usage_reports_buffer_backend.h',
       'browser/android/history_report/usage_reports_buffer_service.cc',
       'browser/android/history_report/usage_reports_buffer_service.h',
       'browser/android/hung_renderer_infobar_delegate.cc',
       'browser/android/hung_renderer_infobar_delegate.h',
       'browser/android/intent_helper.cc',
       'browser/android/intent_helper.h',
+      'browser/android/interests_service.cc',
+      'browser/android/interests_service.h',
       'browser/android/intercept_download_resource_throttle.cc',
       'browser/android/intercept_download_resource_throttle.h',
       'browser/android/java_exception_reporter.cc',
       'browser/android/java_exception_reporter.h',
       'browser/android/large_icon_bridge.cc',
       'browser/android/large_icon_bridge.h',
       'browser/android/location_settings.h',
       'browser/android/location_settings_impl.cc',
       'browser/android/location_settings_impl.h',
       'browser/android/logo_bridge.cc',
@@ skipping 1589 matching lines @@
       'android/java/src/org/chromium/chrome/browser/media/remote/RecordCastAction.java',
       'android/java/src/org/chromium/chrome/browser/media/remote/RemoteMediaPlayerBridge.java',
       'android/java/src/org/chromium/chrome/browser/media/router/ChromeMediaRouter.java',
       'android/java/src/org/chromium/chrome/browser/media/router/ChromeMediaRouterDialogController.java',
       'android/java/src/org/chromium/chrome/browser/metrics/UmaSessionStats.java',
       'android/java/src/org/chromium/chrome/browser/metrics/UmaUtils.java',
       'android/java/src/org/chromium/chrome/browser/metrics/VariationsSession.java',
       'android/java/src/org/chromium/chrome/browser/net/spdyproxy/DataReductionProxySettings.java',
       'android/java/src/org/chromium/chrome/browser/ntp/ForeignSessionHelper.java',
       'android/java/src/org/chromium/chrome/browser/ntp/LogoBridge.java',
+      'android/java/src/org/chromium/chrome/browser/ntp/InterestsService.java',
       'android/java/src/org/chromium/chrome/browser/ntp/NewTabPagePrefs.java',
       'android/java/src/org/chromium/chrome/browser/ntp/RecentlyClosedBridge.java',
       'android/java/src/org/chromium/chrome/browser/infobar/DownloadOverwriteInfoBar.java',
       'android/java/src/org/chromium/chrome/browser/infobar/TranslateInfoBar.java',
       'android/java/src/org/chromium/chrome/browser/net/qualityprovider/ExternalEstimateProviderAndroid.java',
       'android/java/src/org/chromium/chrome/browser/notifications/NotificationUIManager.java',
       'android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageBridge.java',
       'android/java/src/org/chromium/chrome/browser/omnibox/AnswersImage.java',
       'android/java/src/org/chromium/chrome/browser/omnibox/AutocompleteController.java',
       'android/java/src/org/chromium/chrome/browser/omnibox/OmniboxPrerender.java',
@@ skipping 2323 matching lines @@
             '../components/components.gyp:omnibox_browser',
             '../components/components.gyp:rlz',
             '../components/components.gyp:search_engines',
             '../rlz/rlz.gyp:rlz_lib',
           ],
         },
       ],
     }],
   ],
 }