Enable user change background image in settings page in Aura build.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 29c710b22d5a28b731fbbf45dcac4e55e722aa79..8f50124f2d518fbe01d532433f35f7bd37085787 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -12488,6 +12488,15 @@ Some features may be unavailable.  Please check that the profile exists and you
       <message name="IDS_OPTIONS_ENABLE_SCREENLOCKER_CHECKBOX" desc="In the Personal Stuff settings tab, the text on the checkbox to enable screenlocker for current user.">
         Require password to wake from sleep
       </message>
+      <message name="IDS_SET_WALLPAPER_BUTTON" desc="The button to set wallpaper.">
+        Set Wallpaper...
+      </message>
+      <message name="IDS_OPTIONS_SET_WALLPAPER_DIALOG_TITLE" desc="Title of the dialog shown when user wants to change his/her wallpaper.">
+        Set Wallpaper
+      </message>
+      <message name="IDS_OPTIONS_SET_WALLPAPER_DIALOG_TEXT" desc="Text with description of what to do on Change Wallpaper dialog.">
+        Choose a picture to display on your background.
+      </message>
       <message name="IDS_OPTIONS_CHANGE_PICTURE" desc="In the settings tab, the text on the button to change picture for the current user.">
         Change picture...
       </message>