Gaia loading screen changed to align with new Sync screen UI

chrome/app/chromeos_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- ChromeOS-specific strings (included from generated_resources.grd).
      Everything in this file is wrapped in <if expr="chromeos">. -->
 <grit-part>
   <message name="IDS_EMPTY_STRING" desc="Empty string, exist only to make code generic. No translation required.">
   </message>
   <message name="IDS_CHROMEBOOK" desc="The localized name for Chromebook.">
     Chromebook
   </message>
   <message name="IDS_CHROMEBOX" desc="The localized name for Chromebox">
@@ skipping 1352 matching lines @@
   </message>
   <message name="IDS_UPDATE_SCREEN_ACCESSIBLE_TITLE" desc="Title to be spoken on opening the OOBE update screen">
     Chrome updates automatically so you always have the freshest version
   </message>
   <message name="IDS_SIGNIN_SCREEN_TITLE" desc="Title of OOBE/Add User sign-in screen">
     Sign in
   </message>
   <message name="IDS_SIGNIN_SCREEN_PASSWORD_CHANGED" desc="Title of OOBE/Add User sign-in screen when password was changed">
     You have recently changed the password. Please sign in with the new one.
   </message>
+  <message name="IDS_LOGIN_GAIA_LOADING_MESSAGE" desc="Message on the OOBE gaia loading screen">
+    Please wait...
+  </message>
   <message name="IDS_NETWORK_SELECTION_TITLE" desc="Welcome title shown on network selection screen">
     Let's get started
   </message>
   <message name="IDS_OOBE_LANGUAGE_SELECTION_MSG" desc="Chrome OS OOBE: label for language selection dropdown">
     What is your language?
   </message>
   <message name="IDS_NETWORK_SELECTION_SELECT" desc="Label for network selection dropdown">
     Select a network
   </message>
   <message name="IDS_ANOTHER_NETWORK_SELECTION_SELECT" desc="Label for network selection dropdown on the network error screen.">
@@ skipping 4840 matching lines @@
     Enable MTP write support in file manager. Some operations (editing an image on MTP volume) are not supported yet.
   </message>
   <message name="IDS_FILE_SYSTEM_REQUEST_FILE_SYSTEM_NOTIFICATION_MESSAGE" desc="Message in a notification about granted read-only pemissions (read, write, delete, create files and directories) to a volume (eg. USB drive, SD card, MTP device) with the specified name to the extension.">
     Read-only access to <ph name="VOLUME_NAME">$1<ex>FooBar 4GB</ex></ph> has been granted.
   </message>
   <message name="IDS_FILE_SYSTEM_REQUEST_FILE_SYSTEM_NOTIFICATION_WRITABLE_MESSAGE" desc="Message in a notification about granted full permissions (read, write, delete, create files and directories) to a volume (eg. USB drive, SD card, MTP device) with the specified name to the extension.">
     Read and write access to <ph name="VOLUME_NAME">$1<ex>FooBar 4GB</ex></ph> has been granted.
   </message>
 
 </grit-part>