Open hyperlinks in PDF in a new tab when middle mouse clicking.

chrome/browser/resources/pdf/pdf.js

Index: chrome/browser/resources/pdf/pdf.js
diff --git a/chrome/browser/resources/pdf/pdf.js b/chrome/browser/resources/pdf/pdf.js
index d4beae6f9cb67452e8f9801ab982b911f3bd0990..727991c0ba2cd95ea96b150c263e1a4787e01240 100644
--- a/chrome/browser/resources/pdf/pdf.js
+++ b/chrome/browser/resources/pdf/pdf.js
@@ -604,6 +604,28 @@ PDFViewer.prototype = {
             '&body=' + message.data.body;
         window.location.href = href;
         break;
+      case 'getLinkPositionReply':
+        var visiblePage = this.viewport_.getMostVisiblePage();
+        var visiblePageDimensions =
+            this.viewport_.getPageScreenRect(visiblePage);
+
+        var linkExists = false;
+        var viewportCoordinateX;
+        var viewportCoordinateY;
+        if (message.data.x !== undefined && message.data.y !== undefined) {
+          linkExists = true;
+          viewportCoordinateX = message.data.x + visiblePageDimensions.x;
+          viewportCoordinateY = message.data.y + visiblePageDimensions.y +
+              PDFViewer.MATERIAL_TOOLBAR_HEIGHT;
+        }
+
+        this.sendScriptingMessage_({
+          type: 'getLinkPositionReply',
+          linkExists: linkExists,
+          x: viewportCoordinateX,
+          y: viewportCoordinateY
+        });
+        break;
       case 'getPassword':
         // If the password screen isn't up, put it up. Otherwise we're
         // responding to an incorrect password so deny it.
@@ -779,6 +801,7 @@ PDFViewer.prototype = {
     }
 
     switch (message.data.type.toString()) {
+      case 'getLinkPosition':
       case 'getSelectedText':
       case 'print':
       case 'selectAll':