Add component for feature engagement tracking.

chrome/browser/BUILD.gn

Index: chrome/browser/BUILD.gn
diff --git a/chrome/browser/BUILD.gn b/chrome/browser/BUILD.gn
index 898eba8d54e0c0b353ffe0e7b8dc89934334cd2a..d3e7c62263f46ebae1d17eaae79151a73dff75a7 100644
--- a/chrome/browser/BUILD.gn
+++ b/chrome/browser/BUILD.gn
@@ -2744,6 +2744,8 @@ split_static_library("browser") {
       "android/download/ui/thumbnail_provider.h",
       "android/favicon_helper.cc",
       "android/favicon_helper.h",
+      "android/feature_engagement_tracker/feature_engagement_tracker_factory_android.cc",
+      "android/feature_engagement_tracker/feature_engagement_tracker_factory_android.h",
       "android/feature_utilities.cc",
       "android/feature_utilities.h",
       "android/feedback/connectivity_checker.cc",
@@ -3004,6 +3006,8 @@ split_static_library("browser") {
       "download/download_request_infobar_delegate_android.h",
       "engagement/site_engagement_service_android.cc",
       "engagement/site_engagement_service_android.h",
+      "feature_engagement_tracker/feature_engagement_tracker_factory.cc",
+      "feature_engagement_tracker/feature_engagement_tracker_factory.h",
       "geolocation/geolocation_infobar_delegate_android.cc",
       "geolocation/geolocation_infobar_delegate_android.h",
       "history/android/android_history_provider_service.cc",
@@ -3115,6 +3119,7 @@ split_static_library("browser") {
       "//chrome/browser/android/webapk:proto",
       "//components/cdm/browser",
       "//components/data_usage/android",
+      "//components/feature_engagement_tracker",
       "//components/payments/content/android",
       "//components/precache/content",
       "//components/precache/core",
@@ -4063,6 +4068,7 @@ if (is_android) {
       "../android/java/src/org/chromium/chrome/browser/engagement/SiteEngagementService.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/feature_engagement_tracker/FeatureEngagementTrackerFactory.java",
       "../android/java/src/org/chromium/chrome/browser/feedback/ConnectivityChecker.java",
       "../android/java/src/org/chromium/chrome/browser/feedback/ScreenshotTask.java",
       "../android/java/src/org/chromium/chrome/browser/findinpage/FindInPageBridge.java",