Print Preview: Add option to rasterize PDFs and add JPEG compression.

chrome/browser/resources/print_preview/settings/other_options_settings.html

 <div id="other-options-settings"
      class="other-options-settings two-column" hidden>
   <div class="left-column">
     <h1>$i18n{optionsLabel}</h1>
   </div>
   <div class="right-column checkbox">

[dpapad, 2016/12/17 01:19:03]

I don't think that "checkbox" here has any effect. Is it necessary?

[rbpotter, 2016/12/20 22:41:04]

It does actually have an effect. There is formatting applied to ".right-column
.checkbox label" in print_preview.css that spaces out these checkboxes
vertically. With this removed the checkboxes end up right on top of each other.
It would be possible to add "checkbox" to each of the "containers" instead, or
to change the formatting to work differently. Would either of these options be
preferable or should I leave it as is?

     <div id="other-options-collapsible" class="collapsible">
       <div id="header-footer-container">
         <label aria-live="polite">
           <input class="checkbox" type="checkbox">
           <span>$i18n{optionHeaderFooter}</span>
         </label>
       </div>
       <div id="fit-to-page-container">
         <label aria-live="polite">
           <input class="checkbox" type="checkbox">
           <span>$i18n{optionFitToPage}</span>
         </label>
       </div>
       <div id="duplex-container">
         <label aria-live="polite">
           <input class="checkbox" type="checkbox">
           <span>$i18n{optionTwoSided}</span>
         </label>
       </div>
       <div id="css-background-container">
         <label aria-live="polite">
           <input class="checkbox" type="checkbox">
           <span>$i18n{optionBackgroundColorsAndImages}</span>
         </label>
       </div>
+      <div id="rasterize-container">
+        <label aria-live="polite">
+          <input class="checkbox" type="checkbox">

[dpapad, 2016/12/17 01:19:03]

Nit (optional cleanup for a future cleanup): If the previous comment is correct,
then CSS class "checkbox" is not necessary. The only elements that have it would
be <input type="checkbox"> and those can be selected using the
input[type="checkbox"] CSS selector, which is already being used at 
https://cs.chromium.org/chromium/src/chrome/browser/resources/print_preview/p....

+          <span>$i18n{optionRasterize}</span>
+        </label>
+      </div>
       <div id="selection-only-container">
         <label aria-live="polite">
           <input class="checkbox" type="checkbox">
           <span>$i18n{optionSelectionOnly}</span>
         </label>
       </div>
     </div>
   </div>
 </div>