Returning Corresponding Error Message when their is error in OpenTab.

chrome/browser/extensions/extension_tab_util.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/extension_tab_util.h"
 
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "chrome/browser/extensions/api/tabs/tabs_constants.h"
 #include "chrome/browser/extensions/chrome_extension_function.h"
@@ skipping 125 matching lines @@
       return NULL;
   }
 
   // Ensure the selected browser is tabbed.
   if (!browser->is_type_tabbed() && browser->IsAttemptingToCloseBrowser())
     browser = chrome::FindTabbedBrowser(function->GetProfile(),
                                         function->include_incognito(),
                                         browser->host_desktop_type());
 
   if (!browser || !browser->window()) {
-    // TODO(rpaquay): Error message?
+    if (error)
+      *error = keys::kNoCurrentWindowError;
     return NULL;
   }
 
   // TODO(jstritar): Add a constant, chrome.tabs.TAB_ID_ACTIVE, that
   // represents the active tab.
   WebContents* opener = NULL;
   if (params.opener_tab_id.get()) {
     int opener_id = *params.opener_tab_id;
 
     if (!ExtensionTabUtil::GetTabById(opener_id,
                                       function->GetProfile(),
                                       function->include_incognito(),
                                       NULL,
                                       NULL,
                                       &opener,
                                       NULL)) {
-      // TODO(rpaquay): Error message?
+      if (error) {
+        *error = ErrorUtils::FormatErrorMessage(keys::kTabNotFoundError,
+                                                base::IntToString(opener_id));
+      }
       return NULL;
     }
   }
 
   // TODO(rafaelw): handle setting remaining tab properties:
   // -title
   // -favIconUrl
 
   GURL url;
   if (params.url.get()) {
@@ skipping 433 matching lines @@
 
   chrome::NavigateParams params(
       chrome::GetSingletonTabNavigateParams(browser, url_to_navigate));
   params.path_behavior = chrome::NavigateParams::IGNORE_AND_NAVIGATE;
   params.url = url_to_navigate;
   chrome::ShowSingletonTabOverwritingNTP(browser, params);
   return true;
 }
 
 }  // namespace extensions