Add ui preference to render entire file.

This will cause all lines in the file to be added to the DOM.
While being slower (especially for large files) it allows the
browser handle searching the file contents.

Change-Id: I31a9ebb079ec38ecf4fdb62ec073043723fe586f

gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/PreferencesBox.ui.xml

@@ -235,6 +235,13 @@ limitations under the License.
           <g:downFace><ui:msg>Expand</ui:msg></g:downFace>
         </g:ToggleButton></td>
       </tr>
+      <tr>
+        <th><ui:msg>Render</ui:msg></th>
+        <td><g:ToggleButton ui:field='renderEntireFile'>
+          <g:upFace><ui:msg>Fast</ui:msg></g:upFace>
+          <g:downFace><ui:msg>Slow</ui:msg></g:downFace>
+        </g:ToggleButton></td>
+      </tr>
       <tr>
         <td></td>
         <td>