Allow transitions to WebUI pages which are extension urls (new tab page is the relevant example).

content/public/common/page_transition_types.cc

 // Copyright (c) 2010 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 "content/public/common/page_transition_types.h"
 
 #include "base/logging.h"
 
 namespace content {
 
@@ skipping 24 matching lines @@
 }
 
 bool PageTransitionIsRedirect(PageTransition type) {
   return (type & PAGE_TRANSITION_IS_REDIRECT_MASK) != 0;
 }
 
 int32 PageTransitionGetQualifier(PageTransition type) {
   return type & PAGE_TRANSITION_QUALIFIER_MASK;
 }
 
+bool PageTransitionIsWebTriggerable(PageTransition type) {
+  int32 t = PageTransitionStripQualifier(type);
+  return (t == PAGE_TRANSITION_LINK ||
+          t == PAGE_TRANSITION_AUTO_SUBFRAME ||
+          t == PAGE_TRANSITION_MANUAL_SUBFRAME ||
+          t == PAGE_TRANSITION_FORM_SUBMIT);
+}
+
 const char* PageTransitionGetCoreTransitionString(PageTransition type) {
   switch (type & PAGE_TRANSITION_CORE_MASK) {
     case PAGE_TRANSITION_LINK: return "link";
     case PAGE_TRANSITION_TYPED: return "typed";
     case PAGE_TRANSITION_AUTO_BOOKMARK: return "auto_bookmark";
     case PAGE_TRANSITION_AUTO_SUBFRAME: return "auto_subframe";
     case PAGE_TRANSITION_MANUAL_SUBFRAME: return "manual_subframe";
     case PAGE_TRANSITION_GENERATED: return "generated";
     case PAGE_TRANSITION_START_PAGE: return "start_page";
     case PAGE_TRANSITION_FORM_SUBMIT: return "form_submit";
     case PAGE_TRANSITION_RELOAD: return "reload";
     case PAGE_TRANSITION_KEYWORD: return "keyword";
     case PAGE_TRANSITION_KEYWORD_GENERATED: return "keyword_generated";
   }
   return NULL;
 }
 
 }  // namespace content