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

chrome/browser/resources/pdf/pdf_scripting_api.js

Index: chrome/browser/resources/pdf/pdf_scripting_api.js
diff --git a/chrome/browser/resources/pdf/pdf_scripting_api.js b/chrome/browser/resources/pdf/pdf_scripting_api.js
index 712e390207e2cb443611cab2cfcf26eddbfb633b..b75bac6c4323f6707b869dca0e539b9f9cd02ed1 100644
--- a/chrome/browser/resources/pdf/pdf_scripting_api.js
+++ b/chrome/browser/resources/pdf/pdf_scripting_api.js
@@ -76,6 +76,13 @@ function PDFScriptingAPI(window, plugin) {
         if (this.loadCallback_)
           this.loadCallback_(this.loadState_ == LoadState.SUCCESS);
         break;
+      case 'getLinkPositionReply':
+        if (this.getLinkPositionCallback_) {
+          this.getLinkPositionCallback_(event.data.x,
+                                        event.data.y);
+          this.getLinkPositionCallback_ = null;
+        }
+        break;
       case 'getSelectedTextReply':
         if (this.selectedTextCallback_) {
           this.selectedTextCallback_(event.data.selectedText);
@@ -229,6 +236,21 @@ PDFScriptingAPI.prototype = {
       keyEvent: SerializeKeyEvent(keyEvent)
     });
   },
+
+  /**
+   * Get position of the first link in the most visible page of the document.

[Dan Beam, 2016/07/11 21:03:09]

@param {function(number, number):void} callback

+   * @return {boolean} true if the function is successful, false if there is an
+   *     outstanding request that has not been answered.
+   */
+  getLinkPosition: function(callback) {
+    if (this.getLinkPositionCallback_)
+      return false;
+    this.getLinkPositionCallback_ = callback;
+    this.sendMessage_({
+      type: 'getLinkPosition',
+    });
+    return true;
+  },
 };
 
 /**