Add a New Tab page location group policy

chrome/browser/chrome_content_browser_client.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/chrome_content_browser_client.h"
 
 #include <map>
 #include <set>
 #include <utility>
 #include <vector>
@@ skipping 495 matching lines @@
   if (new_host.empty())
     return false;
 
   *url = ReplaceURLHostAndPath(*url, new_host, new_path);
 
   DCHECK(url->is_valid());
 
   return true;
 }
 
+// Handles the rewriting of the new tab page URL based on group policy.
+bool HandleNewTabPageLocationOverride(
+    GURL* url,
+    content::BrowserContext* browser_context) {
+  if (!url->SchemeIs(content::kChromeUIScheme) ||
+      url->host() != chrome::kChromeUINewTabHost)
+    return false;
+
+  Profile* profile = Profile::FromBrowserContext(browser_context);
+  std::string ntp_location =
+      profile->GetPrefs()->GetString(prefs::kNewTabPageLocationOverride);
+  if (ntp_location.empty())
+    return false;
+
+  *url = GURL(ntp_location);
+  return true;
+}
+
 // Handles rewriting Web UI URLs.
 bool HandleWebUI(GURL* url, content::BrowserContext* browser_context) {
   // Do not handle special URLs such as "about:foo"
   if (!url->host().empty()) {
     const GURL chrome_url = AddUberHost(*url);
 
     // Handle valid "chrome://chrome/foo" URLs so the reverse handler will
     // be called.
     if (ChromeWebUIControllerFactory::GetInstance()->UseWebUIForURL(
             browser_context, chrome_url))
@@ skipping 2022 matching lines @@
   for (size_t i = 0; i < extra_parts_.size(); ++i)
     extra_parts_[i]->BrowserURLHandlerCreated(handler);
 
   // about: handler. Must come before chrome: handler, since it will
   // rewrite about: urls to chrome: URLs and then expect chrome: to
   // actually handle them.  Also relies on a preliminary fixup phase.
   handler->SetFixupHandler(&FixupBrowserAboutURL);
   handler->AddHandlerPair(&WillHandleBrowserAboutURL,
                           BrowserURLHandler::null_handler());
 
+  // The group policy NTP URL handler must be registered before the other NTP
+  // URL handlers below.
+  handler->AddHandlerPair(&HandleNewTabPageLocationOverride,
+                          BrowserURLHandler::null_handler());
+
 #if defined(OS_ANDROID)
   // Handler to rewrite chrome://newtab on Android.
   handler->AddHandlerPair(&chrome::android::HandleAndroidNativePageURL,
                           BrowserURLHandler::null_handler());
 #else
   // Handler to rewrite chrome://newtab for InstantExtended.
   handler->AddHandlerPair(&search::HandleNewTabURLRewrite,
                           &search::HandleNewTabURLReverseRewrite);
 #endif
 
@@ skipping 800 matching lines @@
 bool ChromeContentBrowserClient::ShouldRedirectDOMStorageTaskRunner() {
   return variations::GetVariationParamValue(
              "BrowserScheduler", "RedirectDOMStorageTaskRunner") == "true";
 }
 
 bool ChromeContentBrowserClient::
     RedirectNonUINonIOBrowserThreadsToTaskScheduler() {
   return variations::GetVariationParamValue(
              "BrowserScheduler", "RedirectNonUINonIOBrowserThreads") == "true";
 }