Printe Preview: add 'More/less options' button and make non-essential sections collapsible

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 9732bb17dc4a01b19728ed1d39916cbc58bedbba..01db838d1c6d49d8959b1e2e2e69c0287b5e13fc 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -8205,7 +8205,7 @@ Keep your key file in a safe place. You will need it to create new versions of y
           Fit to page
         </message>
         <message name="IDS_PRINT_PREVIEW_OPTION_BACKGROUND_COLORS_AND_IMAGES" desc="Checkbox label shown in print preview page to print webpage backgrounds.">
-          Background colors and images
+          Background graphics
         </message>
         <message name="IDS_PRINT_PREVIEW_OPTION_SELECTION_ONLY" desc="Checkbox label shown in print preview page to print only selected content.">
           Selection only
@@ -8320,6 +8320,12 @@ Keep your key file in a safe place. You will need it to create new versions of y
         <message name="IDS_PRINT_PREVIEW_NO_DESTS_PROMO_ADD_PRINTER_BUTTON_LABEL" desc="Label of button to setup Google Cloud Print printers.">
           Add a printer
         </message>
+        <message name="IDS_MORE_OPTIONS_LABEL" desc="Label of the toggle element to switch between showing more or less printing options in the Print Preview.">
+          More options
+        </message>
+        <message name="IDS_LESS_OPTIONS_LABEL" desc="Label of the toggle element to switch between showing more or less printing options in the Print Preview.">
+          Fewer options
+        </message>
         <message name="IDS_PRINT_PREVIEW_NO_DESTS_PROMO_NOT_NOW_BUTTON_LABEL" desc="Label of button to cancel the Google Cloud Print promotion.">
           Not now
         </message>