Upstream WebAPK notification related code

chrome/android/webapk/shell_apk/BUILD.gn

Index: chrome/android/webapk/shell_apk/BUILD.gn
diff --git a/chrome/android/webapk/shell_apk/BUILD.gn b/chrome/android/webapk/shell_apk/BUILD.gn
index f0529e9fad697ec5ca2b043b04ace8fb6442e5bc..8ad2e04e2d6fe611ffbc03d6c5e8e0463488c75f 100644
--- a/chrome/android/webapk/shell_apk/BUILD.gn
+++ b/chrome/android/webapk/shell_apk/BUILD.gn
@@ -55,10 +55,14 @@ android_resources("shell_apk_resources") {
 android_apk("webapk") {
   android_manifest = shell_apk_manifest
   apk_name = "WebApk.$webapk_manifest_package_origin"
-  java_files = [ "src/org/chromium/webapk/shell_apk/MainActivity.java" ]
+  java_files = [
+    "src/org/chromium/webapk/shell_apk/MainActivity.java",
+    "src/org/chromium/webapk/shell_apk/WebApkServiceFactory.java",
+  ]
   deps = [
     ":shell_apk_manifest",
     ":shell_apk_resources",
     "//chrome/android/webapk/libs/common",
+    "//chrome/android/webapk/libs/runtime_library",
   ]
 }