Add initial support for runtime permissions in android M.

chrome/browser/content_settings/permission_infobar_delegate.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/content_settings/permission_infobar_delegate.h"
 
 #include "chrome/browser/content_settings/permission_context_uma_util.h"
 #include "chrome/browser/content_settings/permission_queue_controller.h"
 #include "chrome/grit/generated_resources.h"
 #include "components/infobars/core/infobar.h"
@@ skipping 16 matching lines @@
 
 infobars::InfoBarDelegate::Type
 PermissionInfobarDelegate::GetInfoBarType() const {
   return PAGE_ACTION_TYPE;
 }
 
 void PermissionInfobarDelegate::InfoBarDismissed() {
   SetPermission(false, false);
 }
 
+PermissionInfobarDelegate*
+PermissionInfobarDelegate::AsPermissionInfobarDelegate() {
+  return this;
+}
+
 base::string16 PermissionInfobarDelegate::GetButtonLabel(
     InfoBarButton button) const {
   return l10n_util::GetStringUTF16((button == BUTTON_OK) ?
       IDS_PERMISSION_ALLOW : IDS_PERMISSION_DENY);
 }
 
 bool PermissionInfobarDelegate::Accept() {
   SetPermission(true, true);
   return true;
 }
 
 bool PermissionInfobarDelegate::Cancel() {
   SetPermission(true, false);
   return true;
 }
 
 void PermissionInfobarDelegate::SetPermission(bool update_content_setting,
                                               bool allowed) {
   action_taken_ = true;
   controller_->OnPermissionSet(
       id_, requesting_origin_,
       InfoBarService::WebContentsFromInfoBar(
           infobar())->GetLastCommittedURL().GetOrigin(),
       update_content_setting, allowed);
 }