[Smart Lock] Add a setting to require close proximity in order for unlocking to work.

chrome/browser/resources/options/browser_options.js

Index: chrome/browser/resources/options/browser_options.js
diff --git a/chrome/browser/resources/options/browser_options.js b/chrome/browser/resources/options/browser_options.js
index 3c8c7b1f3aff580e63c4275fd3c0f2d60b7f288c..6c3c9a2500da9b155a7250f9d6a222a343cb3b8b 100644
--- a/chrome/browser/resources/options/browser_options.js
+++ b/chrome/browser/resources/options/browser_options.js
@@ -541,6 +541,9 @@ cr.define('options', function() {
           PageManager.showPageByName('easyUnlockTurnOffOverlay');
         };
       }
+      if (loadTimeData.getBoolean('easyUnlockProximityDetectionAllowed')) {
+        $('easy-unlock-enable-proximity-detection').hidden = false;

[Evan Stade, 2014/11/05 22:24:16]

nit: foo.hidden = !condition;

[Ilya Sherman, 2014/11/05 22:40:58]

Done.

+      }
 
       // Website Settings section.
       if (loadTimeData.getBoolean('websiteSettingsManagerEnabled')) {