Type check PDF plugin JS code, down to 53 errors.

chrome/browser/resources/pdf/viewport.js

 // Copyright 2014 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.
 
 /**
  * Returns the height of the intersection of two rectangles.
  * @param {Object} rect1 the first rect
  * @param {Object} rect2 the second rect
  * @return {number} the height of the intersection of the rects
  */
@@ skipping 428 matching lines @@
 
   /**
    * @type {Viewport.FittingType} the fitting type the viewport is currently in.
    */
   get fittingType() {
     return this.fittingType_;
   },
 
   /**
    * @private
-   * @param {integer} y the y-coordinate to get the page at.
-   * @return {integer} the index of a page overlapping the given y-coordinate.
+   * @param {number} y the y-coordinate to get the page at.
+   * @return {number} the index of a page overlapping the given y-coordinate.
    */
   getPageAtY_: function(y) {
     var min = 0;
     var max = this.pageDimensions_.length - 1;
     while (max >= min) {
       var page = Math.floor(min + ((max - min) / 2));
       // There might be a gap between the pages, in which case use the bottom
       // of the previous page as the top for finding the page.
       var top = 0;
       if (page > 0) {
         top = this.pageDimensions_[page - 1].y +
             this.pageDimensions_[page - 1].height;
       }
       var bottom = this.pageDimensions_[page].y +
           this.pageDimensions_[page].height;
 
       if (top <= y && bottom > y)
         return page;
       else if (top > y)
         max = page - 1;
       else
         min = page + 1;
     }
     return 0;
   },
 
   /**
    * Returns the page with the greatest proportion of its height in the current
    * viewport.
-   * @return {int} the index of the most visible page.
+   * @return {number} the index of the most visible page.
    */
   getMostVisiblePage: function() {
     var firstVisiblePage = this.getPageAtY_(this.position.y / this.zoom);
     if (firstVisiblePage == this.pageDimensions_.length - 1)
       return firstVisiblePage;
 
     var viewportRect = {
       x: this.position.x / this.zoom,
       y: this.position.y / this.zoom,
       width: this.size.width / this.zoom,
@@ skipping 324 matching lines @@
     spaceOnLeft = Math.max(spaceOnLeft, 0);
 
     return {
       x: x * this.zoom + spaceOnLeft - this.window_.pageXOffset,
       y: insetDimensions.y * this.zoom - this.window_.pageYOffset,
       width: insetDimensions.width * this.zoom,
       height: insetDimensions.height * this.zoom
     };
   }
 };