[AppRemoting] Break out AppRemoting shared module (re-land).

remoting/app_remoting_webapp_files.gypi

Index: remoting/app_remoting_webapp_files.gypi
diff --git a/remoting/app_remoting_webapp_files.gypi b/remoting/app_remoting_webapp_files.gypi
index fc5686d3ba19eef0ec1d4ef7f5faad36f80a254e..09ce4a24f0145688e590d5babd934ea08b342571 100644
--- a/remoting/app_remoting_webapp_files.gypi
+++ b/remoting/app_remoting_webapp_files.gypi
@@ -57,7 +57,6 @@
       'webapp/app_remoting/js/app_remoting.js',
       'webapp/app_remoting/js/app_remoting_activity.js',
       'webapp/app_remoting/js/ar_auth_dialog.js',
-      'webapp/app_remoting/js/ar_main.js',
       'webapp/app_remoting/js/context_menu_adapter.js',
       'webapp/app_remoting/js/context_menu_chrome.js',
       'webapp/app_remoting/js/context_menu_dom.js',
@@ -69,8 +68,6 @@
       'webapp/app_remoting/js/loading_window.js',
       'webapp/app_remoting/js/submenu_manager.js',
       'webapp/app_remoting/js/window_activation_menu.js',
-      'webapp/base/js/application.js',
-      'webapp/base/js/base.js',
       'webapp/base/js/message_window_helper.js',
       'webapp/base/js/message_window_manager.js',
       '<@(remoting_webapp_shared_js_auth_google_files)',
@@ -82,18 +79,30 @@
       '<@(remoting_webapp_shared_js_ui_files)',
     ],
 
-    'ar_background_js_files': [
+    # Variables for ar_background.html.
+    'ar_background_template':
+      '<(DEPTH)/remoting/webapp/app_remoting/html/template_background.html',
+    'ar_background_html_js_files': [
       'webapp/app_remoting/js/ar_background.js',
       'webapp/base/js/platform.js',
     ],
 
+    'ar_vendor_js_files': [
+      'webapp/app_remoting/vendor/arv_main.js',
+    ],
+
+    'ar_vendor_html_files': [
+      'webapp/app_remoting/vendor/arv_background.html',
+      'webapp/app_remoting/vendor/arv_main.html',
+      'webapp/app_remoting/vendor/arv_wcs_sandbox.html',
+    ],
+
     'ar_all_js_files': [
       '<@(ar_main_js_files)',
       '<@(ar_feedback_consent_html_js_files)',
       '<@(remoting_webapp_message_window_html_js_files)',
       '<@(remoting_webapp_wcs_sandbox_html_js_files)',
-      # Referenced from the manifest.
-      '<@(ar_background_js_files)',
+      '<@(ar_background_html_js_files)',
     ],
 
     # Files that contain localizable strings.