Add component for feature engagement tracking.

chrome/android/java_sources.gni

 # Copyright 2016 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.
 
 chrome_java_sources = [
   "java/src/com/google/android/apps/chrome/appwidget/bookmarks/BookmarkThumbnailWidgetProvider.java",
   "java/src/org/chromium/chrome/browser/ActivityTabTaskDescriptionHelper.java",
   "java/src/org/chromium/chrome/browser/ActivityTaskDescriptionIconGenerator.java",
   "java/src/org/chromium/chrome/browser/AfterStartupTaskUtils.java",
   "java/src/org/chromium/chrome/browser/ApplicationInitialization.java",
@@ skipping 341 matching lines @@
   "java/src/org/chromium/chrome/browser/externalauth/ExternalAuthUtils.java",
   "java/src/org/chromium/chrome/browser/externalauth/UserRecoverableErrorHandler.java",
   "java/src/org/chromium/chrome/browser/externalauth/VerifiedHandler.java",
   "java/src/org/chromium/chrome/browser/externalnav/ExternalNavigationDelegate.java",
   "java/src/org/chromium/chrome/browser/externalnav/ExternalNavigationDelegateImpl.java",
   "java/src/org/chromium/chrome/browser/externalnav/ExternalNavigationHandler.java",
   "java/src/org/chromium/chrome/browser/externalnav/ExternalNavigationParams.java",
   "java/src/org/chromium/chrome/browser/externalnav/IntentWithGesturesHandler.java",
   "java/src/org/chromium/chrome/browser/favicon/FaviconHelper.java",
   "java/src/org/chromium/chrome/browser/favicon/LargeIconBridge.java",
+  "java/src/org/chromium/chrome/browser/feature_engagement_tracker/FeatureEngagementTrackerFactory.java",
   "java/src/org/chromium/chrome/browser/feedback/ConnectivityChecker.java",
   "java/src/org/chromium/chrome/browser/feedback/ConnectivityTask.java",
   "java/src/org/chromium/chrome/browser/feedback/EmptyFeedbackReporter.java",
   "java/src/org/chromium/chrome/browser/feedback/FeedbackCollector.java",
   "java/src/org/chromium/chrome/browser/feedback/FeedbackReporter.java",
   "java/src/org/chromium/chrome/browser/feedback/ScreenshotTask.java",
   "java/src/org/chromium/chrome/browser/findinpage/FindInPageBridge.java",
   "java/src/org/chromium/chrome/browser/findinpage/FindMatchRectsDetails.java",
   "java/src/org/chromium/chrome/browser/findinpage/FindNotificationDetails.java",
   "java/src/org/chromium/chrome/browser/firstrun/AccountFirstRunFragment.java",
@@ skipping 1286 matching lines @@
   "sync_shell/javatests/src/org/chromium/chrome/browser/sync/SyncTestBase.java",
   "sync_shell/javatests/src/org/chromium/chrome/browser/sync/TypedUrlsTest.java",
   "sync_shell/javatests/src/org/chromium/chrome/browser/sync/ui/PassphraseTypeDialogFragmentTest.java",
 ]
 
 # Only used for testing, should not be shipped to end users.
 if (!is_official_build) {
   chrome_java_sources += [ "java/src/org/chromium/chrome/browser/offlinepages/evaluation/OfflinePageEvaluationBridge.java" ]
   chrome_test_java_sources += [ "javatests/src/org/chromium/chrome/browser/offlinepages/OfflinePageSavePageLaterEvaluationTest.java" ]
 }