OOP PDF - Add support for "zoom" open pdf parameter

chrome/browser/resources/pdf/open_pdf_params_parser.js

Index: chrome/browser/resources/pdf/open_pdf_params_parser.js
diff --git a/chrome/browser/resources/pdf/open_pdf_params_parser.js b/chrome/browser/resources/pdf/open_pdf_params_parser.js
index 7f55db0434d065c42e41d5ae4f0dccd11e76a862..f4fe8e7354a1617a6c5929c23e72379af59b9465 100644
--- a/chrome/browser/resources/pdf/open_pdf_params_parser.js
+++ b/chrome/browser/resources/pdf/open_pdf_params_parser.js
@@ -18,6 +18,36 @@ function OpenPDFParamsParser(url) {
 OpenPDFParamsParser.prototype = {
   /**
    * @private
+   * Parse zoom parameter of open PDF parameters. If this
+   * parameter is passed while opening PDF then PDF should be opened
+   * at the specified zoom level.
+   * @param {number} zoom value.
+   */
+  parseZoomParam_: function(paramValue) {
+    var paramValueSplit = paramValue.split(',');
+    if ((paramValueSplit.length != 1) && (paramValueSplit.length != 3))
+      return;
+
+    // User scale of 100 means zoom value of 100% i.e. zoom factor of 1.0.
+    var zoomFactor = parseFloat(paramValueSplit[0]) / 100;
+    if (isNaN(zoomFactor))
+      return;
+
+    // Handle #zoom=scale.
+    if (paramValueSplit.length == 1) {
+      this.urlParams['zoom'] = zoomFactor;
+      return;
+    }
+
+    // Handle #zoom=scale,left,top.
+    var position = {x: parseFloat(paramValueSplit[1]),
+                    y: parseFloat(paramValueSplit[2])};
+    this.urlParams['position'] = position;
+    this.urlParams['zoom'] = zoomFactor;
+  },
+
+  /**
+   * @private
    * Parse open PDF parameters. These parameters are mentioned in the url
    * and specify actions to be performed when opening pdf files.
    * See http://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/
@@ -44,5 +74,8 @@ OpenPDFParamsParser.prototype = {
       if (!isNaN(pageNumber))
         this.urlParams['page'] = pageNumber - 1;
     }
+
+    if ('zoom' in paramsDictionary)
+      this.parseZoomParam_(paramsDictionary['zoom']);
   }
 };