Redirect chrome://welcome to the new tab page.

chrome/browser/android/new_tab_page_url_handler.cc

 // Copyright 2014 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/android/new_tab_page_url_handler.h"
 
 #include <string>
 
 #include "base/strings/string_util.h"
 #include "chrome/common/url_constants.h"
 #include "content/public/common/url_constants.h"
 #include "url/gurl.h"
 
 namespace {
 const char kBookmarkFolderPath[] = "folder/";
+const char kLegacyWelcomeHost[] = "welcome";
 }
 
 namespace chrome {
 namespace android {
 
 bool HandleAndroidNativePageURL(GURL* url,
                                 content::BrowserContext* browser_context) {
-  if (url->SchemeIs(content::kChromeUIScheme) &&
-      url->host() == chrome::kChromeUINewTabHost) {
-    *url = GURL(chrome::kChromeUINativeNewTabURL);
-    return true;
+  if (url->SchemeIs(content::kChromeUIScheme)) {
+    // TODO(newt): stop redirecting chrome://welcome to chrome-native://newtab
+    // when M39 is a distant memory. http://crbug.com/455427
+    if (url->host() == chrome::kChromeUINewTabHost ||
+        url->host() == kLegacyWelcomeHost) {
+      *url = GURL(chrome::kChromeUINativeNewTabURL);
+      return true;
+    }
   }
 
   if (url->SchemeIs(chrome::kChromeNativeScheme) &&
       url->host() == kChromeUIBookmarksHost) {
     std::string ref = url->ref();
     if (!ref.empty()) {
       *url = GURL(std::string(kChromeUINativeBookmarksURL)
                       .append(kBookmarkFolderPath)
                       .append(ref));
       return true;
     }
   }
 
   return false;
 }
 
 }  // namespace android
 }  // namespace chrome