Print Preview: Making the UI not block when preview is generated

Silently rerendering the preview when the user changes the settings.

BUG=82961, 83442, 83660
TEST=Load a multi-page doc in the print preview tab. Change the settings.
The displayed doc shuld reflect the latest changes.


Review URL: http://codereview.chromium.org/7051040

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@86470 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/resources/print_preview.css

@@ -606,7 +606,6 @@ body #individual-pages {
 #collate-option {
  -webkit-transition: opacity 200ms, -webkit-transform 200ms;
  -webkit-padding-start: 5px;
- display: inline-block;
  opacity: 1;
 }
 

chrome/browser/resources/print_preview.html

@@ -57,7 +57,7 @@
                   max="999" maxlength="3" class="number small"/>
               <button id="increment">+</button>
               <button id="decrement">–</button>
-              <span id="collate-option" hidden>
+              <span id="collate-option" class="hidden">
                 <input id="collate" name="collate" type="checkbox" />
                 <label for="collate" i18n-content="optionCollate"></label>
               </span>