PDF: Do more robust page number parsing in OOP plugin.

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 area of the intersection of two rectangles.
  * @param {Object} rect1 the first rect
  * @param {Object} rect2 the second rect
  * @return {number} the area of the intersection of the rects
  */
@@ skipping 431 matching lines @@
         if (Viewport.ZOOM_FACTORS[i] > this.zoom_)
           nextZoom = Viewport.ZOOM_FACTORS[i];
       }
       this.setZoomInternal_(nextZoom);
       this.updateViewport_();
     }.bind(this));
   },
 
   /**
    * Go to the given page index.
-   * @param {number} page the index of the page to go to.
+   * @param {number} page the index of the page to go to. zero-based.
    */
   goToPage: function(page) {
     this.mightZoom_(function() {
       if (this.pageDimensions_.length == 0)
         return;
       if (page < 0)
         page = 0;
       if (page >= this.pageDimensions_.length)
         page = this.pageDimensions_.length - 1;
       var dimensions = this.pageDimensions_[page];
@@ skipping 66 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_
     };
   }
 };