Generate license file separately

android_webview/apk/system_webview_paks.gypi

 # Copyright (c) 2015 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.
 #
 # This file defines the name of webviewchromium.pak and the set of locales that
 # should be packed inside the System WebView apk, these files also are used in
 # downstream.
 # TODO: consider unifying this list with the one in chrome_android_paks.gypi
 # once Chrome includes all the locales that the WebView needs.
 {
   'variables': {
+    'webview_licenses_path': '<(PRODUCT_DIR)/android_webview_assets/webview_licenses.notice',
     'webview_chromium_pak_path': '<(PRODUCT_DIR)/android_webview_assets/webviewchromium.pak',
     'webview_locales_input_paks_folder': '<(PRODUCT_DIR)/android_webview_assets/locales/',
     # The list of locale are only supported by WebView.
     'webview_locales_input_individual_paks': [
       '<(webview_locales_input_paks_folder)/bn.pak',
       '<(webview_locales_input_paks_folder)/et.pak',
       '<(webview_locales_input_paks_folder)/gu.pak',
       '<(webview_locales_input_paks_folder)/kn.pak',
       '<(webview_locales_input_paks_folder)/ml.pak',
       '<(webview_locales_input_paks_folder)/mr.pak',
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       '<(webview_locales_input_paks_folder)/th.pak',
       '<(webview_locales_input_paks_folder)/tr.pak',
       '<(webview_locales_input_paks_folder)/uk.pak',
       '<(webview_locales_input_paks_folder)/vi.pak',
       '<(webview_locales_input_paks_folder)/zh-CN.pak',
       '<(webview_locales_input_paks_folder)/zh-TW.pak',
     ],
   },
 }