Fix for PDFs with lots of named destinations take a long time to load.

chrome/browser/resources/pdf/navigator.js

Index: chrome/browser/resources/pdf/navigator.js
diff --git a/chrome/browser/resources/pdf/navigator.js b/chrome/browser/resources/pdf/navigator.js
index 57c15d4d26c47c983f83a839c766cb79d22f9dfe..3068592bda8862bc3a19a016cfe601e66b1311c5 100644
--- a/chrome/browser/resources/pdf/navigator.js
+++ b/chrome/browser/resources/pdf/navigator.js
@@ -74,12 +74,14 @@ Navigator.prototype = {
     if (newTab) {
       this.navigateInNewTabCallback_(url);
     } else {
-      var pageNumber =
-          this.paramsParser_.getViewportFromUrlParams(url).page;
-      if (pageNumber != undefined)
-        this.viewport_.goToPage(pageNumber);
-      else
-        this.navigateInCurrentTabCallback_(url);
+      this.paramsParser_.getViewportFromUrlParams(
+          url, function(initialViewport) {

[raymes, 2015/02/16 02:02:30]

nit: initialViewport->viewportPosition 
nit: could you pull this function out into a separate function in the class
called onViewportReceived?

[Deepak, 2015/02/16 06:45:37]

Done.

+            var pageNumber = initialViewport.page;
+            if (pageNumber != undefined)
+              this.viewport_.goToPage(pageNumber);
+            else
+              this.navigateInCurrentTabCallback_(url);
+          }.bind(this));
     }
   }
 };