Implement <appview>

chrome/browser/extensions/api/guest_view/guest_view_internal_api.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/extensions/api/guest_view/guest_view_internal_api.h"
 
 #include "chrome/browser/guest_view/guest_view_base.h"
 #include "chrome/browser/guest_view/guest_view_manager.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/extensions/api/guest_view_internal.h"
@@ skipping 19 matching lines @@
 
   base::DictionaryValue* create_params;
   EXTENSION_FUNCTION_VALIDATE(args_->GetDictionary(1, &create_params));
 
   const PermissionsData* permissions_data = GetExtension()->permissions_data();
   if (!permissions_data->HasAPIPermission(APIPermission::kWebView) &&
       !permissions_data->HasAPIPermission(APIPermission::kAppView)) {
     LOG(ERROR) << kPermissionRequiredError;
     error_ = kPermissionRequiredError;
     SendResponse(false);
+    return true;
   }
 
   GuestViewManager* guest_view_manager =
       GuestViewManager::FromBrowserContext(browser_context());
 
   GuestViewManager::WebContentsCreatedCallback callback =
       base::Bind(&GuestViewInternalCreateGuestFunction::CreateGuestCallback,
                  this);
   guest_view_manager->CreateGuest(view_type,
                                   extension_id(),
                                   render_view_host()->GetProcess()->GetID(),
                                   *create_params,
                                   callback);
 
   return true;
 }
 
 void GuestViewInternalCreateGuestFunction::CreateGuestCallback(
     content::WebContents* guest_web_contents) {
-  if (!guest_web_contents)
-    return;
-  GuestViewBase* guest = GuestViewBase::FromWebContents(guest_web_contents);
-  SetResult(base::Value::CreateIntegerValue(guest->GetGuestInstanceID()));
+  int guest_instance_id = 0;
+  if (guest_web_contents) {
+    GuestViewBase* guest = GuestViewBase::FromWebContents(guest_web_contents);
+    guest_instance_id = guest->GetGuestInstanceID();
+  }
+  SetResult(base::Value::CreateIntegerValue(guest_instance_id));
   SendResponse(true);
 }
 
 }  // namespace extensions