Upstream: Extract "WebAPK service" implementation from Chrome APK

chrome/android/webapk/libs/runtime_library/BUILD.gn

 # 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.
 
 import("//build/config/android/rules.gni")
 
 android_aidl("webapk_service_aidl") {
   import_include = "src/org/chromium/webapk/lib/runtime_library"
   interface_file = "src/org/chromium/webapk/lib/runtime_library/common.aidl"
   sources = [
     "src/org/chromium/webapk/lib/runtime_library/IWebApkApi.aidl",
   ]
 }
 
 android_library("runtime_library") {
+  dex_path = "$target_gen_dir/web_apk.dex"
   java_files =
       [ "src/org/chromium/webapk/lib/runtime_library/WebApkServiceImpl.java" ]
   srcjar_deps = [ ":webapk_service_aidl" ]
 }
+
+android_assets("runtime_library_assets") {
+  sources = [
+    "$target_gen_dir/web_apk.dex",
+  ]
+  disable_compression = true
+
+  deps = [
+    ":runtime_library",
+  ]
+}