Added support for passing WindowOpenDisposition into BrowserInstantController::OpenURL() from the o…

chrome/browser/resources/local_omnibox_popup/local_omnibox_popup.js

Index: chrome/browser/resources/local_omnibox_popup/local_omnibox_popup.js
diff --git a/chrome/browser/resources/local_omnibox_popup/local_omnibox_popup.js b/chrome/browser/resources/local_omnibox_popup/local_omnibox_popup.js
index c80c0aa1e75e1be1e8177fa8b30a67d080b7dff4..2a0c81a096f55489f3de00a6c1d3785b14d6e337 100644
--- a/chrome/browser/resources/local_omnibox_popup/local_omnibox_popup.js
+++ b/chrome/browser/resources/local_omnibox_popup/local_omnibox_popup.js
@@ -2,6 +2,31 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+/**
+ * @fileoverview Support for omnibox behavior in offline mode or when API
+ * features are not supported on the server.
+ */
+
+// ==========================================================
+//  Enums.
+// ==========================================================
+
+/**
+ * Possible behaviors for navigateContentWindow.
+ * @enum {number}
+ */
+var WindowOpenDisposition = {
+  CURRENT_TAB: 1,
+  NEW_BACKGROUND_TAB: 2
+};
+
+/**
+ * The JavaScript button event value for a middle click.
+ * @type {number}
+ * @const
+ */
+var MIDDLE_MOUSE_BUTTON = 1;
+
 // =============================================================================
 //                               Util functions
 // =============================================================================
@@ -53,8 +78,8 @@ function addSuggestionToBox(suggestion, box, select) {
   contentsContainer.appendChild(contents);
   suggestionDiv.appendChild(contentsContainer);
   var restrictedId = suggestion.rid;
-  suggestionDiv.onclick = function() {
-    handleSuggestionClick(restrictedId);
+  suggestionDiv.onclick = function(event) {
+    handleSuggestionClick(restrictedId, event);
   };
 
   restrictedIds.push(restrictedId);
@@ -193,13 +218,27 @@ function appendSuggestionStyles() {
 }
 
 /**
+ * Extract the desired navigation behavior from a click event.
+ * @param {Event} event The click event.
+ * @return {WindowOpenDisposition} The desired behavior for
+ *     navigateContentWindow.
+ */
+function getDispositionFromClick(event) {
+  if (event.button == MIDDLE_MOUSE_BUTTON)
+    return WindowOpenDisposition.NEW_BACKGROUND_TAB;
+  return WindowOpenDisposition.CURRENT_TAB;
+}
+
+/**
  * Handles suggestion clicks.
  * @param {integer} restrictedId The restricted id of the suggestion being
  *     clicked.
+ * @param {Event} event The click event.
  */
-function handleSuggestionClick(restrictedId) {
+function handleSuggestionClick(restrictedId, event) {
   clearSuggestions();
-  getApiObjectHandle().navigateContentWindow(restrictedId);
+  getApiObjectHandle().navigateContentWindow(restrictedId,
+                                             getDispositionFromClick(event));
 }
 
 /**