Add external data use observer

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 84 matching lines @@
       'browser/android/contextualsearch/contextual_search_context.cc',
       'browser/android/contextualsearch/contextual_search_context.h',
       'browser/android/contextualsearch/contextual_search_delegate.cc',
       'browser/android/contextualsearch/contextual_search_delegate.h',
       'browser/android/contextualsearch/contextual_search_manager.cc',
       'browser/android/contextualsearch/contextual_search_manager.h',
       'browser/android/contextualsearch/contextual_search_tab_helper.cc',
       'browser/android/contextualsearch/contextual_search_tab_helper.h',
       'browser/android/cookies/cookies_fetcher.cc',
       'browser/android/cookies/cookies_fetcher.h',
+      'browser/android/datausage/external_data_use_observer.cc',
+      'browser/android/datausage/external_data_use_observer.h',
       'browser/android/dev_tools_discovery_provider_android.cc',
       'browser/android/dev_tools_discovery_provider_android.h',
       'browser/android/dev_tools_server.cc',
       'browser/android/dev_tools_server.h',
       'browser/android/document/document_web_contents_delegate.cc',
       'browser/android/dom_distiller/external_feedback_reporter_android.cc',
       'browser/android/dom_distiller/external_feedback_reporter_android.h',
       'browser/android/download/android_download_manager_overwrite_infobar_delegate.cc',
       'browser/android/download/android_download_manager_overwrite_infobar_delegate.h',
       'browser/android/download/chrome_download_delegate.cc',
@@ skipping 1637 matching lines @@
       'android/java/src/org/chromium/chrome/browser/compositor/scene_layer/SceneLayer.java',
       'android/java/src/org/chromium/chrome/browser/compositor/scene_layer/StaticTabSceneLayer.java',
       'android/java/src/org/chromium/chrome/browser/compositor/scene_layer/TabListSceneLayer.java',
       'android/java/src/org/chromium/chrome/browser/compositor/scene_layer/TabStripSceneLayer.java',
       'android/java/src/org/chromium/chrome/browser/ConnectionInfoPopup.java',
       'android/java/src/org/chromium/chrome/browser/contextmenu/ContextMenuHelper.java',
       'android/java/src/org/chromium/chrome/browser/contextmenu/ContextMenuParams.java',
       'android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchManager.java',
       'android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchTabHelper.java',
       'android/java/src/org/chromium/chrome/browser/cookies/CookiesFetcher.java',
+      'android/java/src/org/chromium/chrome/browser/datausage/ExternalDataUseObserver.java',
       'android/java/src/org/chromium/chrome/browser/DevToolsServer.java',
       'android/java/src/org/chromium/chrome/browser/database/SQLiteCursor.java',
       'android/java/src/org/chromium/chrome/browser/document/DocumentWebContentsDelegate.java',
       'android/java/src/org/chromium/chrome/browser/dom_distiller/DomDistillerFeedbackReporter.java',
       'android/java/src/org/chromium/chrome/browser/dom_distiller/DomDistillerServiceFactory.java',
       'android/java/src/org/chromium/chrome/browser/dom_distiller/DomDistillerTabUtils.java',
       'android/java/src/org/chromium/chrome/browser/download/ChromeDownloadDelegate.java',
       'android/java/src/org/chromium/chrome/browser/favicon/FaviconHelper.java',
       'android/java/src/org/chromium/chrome/browser/favicon/LargeIconBridge.java',
       'android/java/src/org/chromium/chrome/browser/feedback/ConnectivityChecker.java',
@@ skipping 2346 matching lines @@
             '../components/components.gyp:omnibox_browser',
             '../components/components.gyp:rlz',
             '../components/components.gyp:search_engines',
             '../rlz/rlz.gyp:rlz_lib',
           ],
         },
       ],
     }],
   ],
 }