Make loading dialog prettier.

remoting/app_remoting_webapp_build.gypi

Index: remoting/app_remoting_webapp_build.gypi
diff --git a/remoting/app_remoting_webapp_build.gypi b/remoting/app_remoting_webapp_build.gypi
index aae7f99d3e08b69154d4babe8f9130c5a5339849..9f7572cb4162b0edec2ee70793210424a7351633 100644
--- a/remoting/app_remoting_webapp_build.gypi
+++ b/remoting/app_remoting_webapp_build.gypi
@@ -37,8 +37,10 @@
         '>(ar_app_path)/icon16.png',
         '>(ar_app_path)/icon48.png',
         '>(ar_app_path)/icon128.png',
+        '>(ar_app_path)/loading_splash.png',
       ],
       'ar_generated_html_files': [
+        '<(SHARED_INTERMEDIATE_DIR)/>(_target_name)/loading_window.html',
         '<(SHARED_INTERMEDIATE_DIR)/>(_target_name)/main.html',
         '<(SHARED_INTERMEDIATE_DIR)/>(_target_name)/message_window.html',
         '<(SHARED_INTERMEDIATE_DIR)/>(_target_name)/wcs_sandbox.html',
@@ -177,6 +179,24 @@
         ],
       },
       {
+        'action_name': 'Build ">(ar_app_name)" loading_window.html',
+        'inputs': [
+          '<(DEPTH)/remoting/webapp/build-html.py',
+          '<(ar_loading_window_template)',
+        ],
+        'outputs': [
+          '<(SHARED_INTERMEDIATE_DIR)/>(_target_name)/loading_window.html',
+        ],
+        'action': [
+          'python', '<(DEPTH)/remoting/webapp/build-html.py',
+          '<(SHARED_INTERMEDIATE_DIR)/>(_target_name)/loading_window.html',
+          '<(ar_loading_window_template)',
+          # The loading window is just a reskin of the message window--all
+          # JS code is shared.
+          '--js', '<@(remoting_webapp_message_window_html_all_js_files)',
+        ],
+      },
+      {
         'action_name': 'Build ">(ar_app_name)" message_window.html',
         'inputs': [
           '<(DEPTH)/remoting/webapp/build-html.py',