Fix for overlapping of cursor with page number in page selector.

chrome/browser/resources/pdf/elements/viewer-page-selector/viewer-page-selector.js

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 Polymer({
   is: 'viewer-page-selector',
 
   properties: {
     /**
      * The number of pages the document contains.
@@ skipping 20 matching lines @@
 
     if (!isNaN(page) && page <= this.docLength && page > 0)
       this.fire('change-page', {page: page - 1});
     else
       this.$.input.value = this.pageNo;
     this.$.input.blur();
   },
 
   docLengthChanged: function() {
     var numDigits = this.docLength.toString().length;
-    this.$.pageselector.style.width = numDigits + 'ch';
+    // Increasing the width of pageselector by 1 'ch' for cursor.
+    this.$.pageselector.style.width = numDigits + 1 + 'ch';
     // Set both sides of the slash to the same width, so that the layout is
     // exactly centered.
     this.$['pagelength-spacer'].style.width = numDigits + 'ch';

[tsergeant, 2016/01/06 01:58:59]

Any changes to line 42 need to be made here as well, to ensure the selector
stays centered.

[Deepak, 2016/01/06 07:35:35]

Done.

   },
 
   select: function() {
     this.$.input.select();
   },
 
   /**
    * @return {boolean} True if the selector input field is currently focused.
    */
   isActive: function() {
     return this.shadowRoot.activeElement == this.$.input;
   }
 });