1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "chrome/browser/tab_contents/tab_util.h"
6
7#include "chrome/browser/profiles/profile.h"
8#include "chrome/browser/ui/webui/chrome_web_ui_controller_factory.h"
9#include "chrome/common/chrome_switches.h"
10#include "content/public/browser/render_view_host.h"
11#include "content/public/browser/site_instance.h"
12#include "content/public/browser/web_contents.h"
13#include "url/gurl.h"
14
15#if defined(ENABLE_EXTENSIONS)
16#include "extensions/browser/extension_registry.h"
17#endif
18
19using content::RenderViewHost;
20using content::SiteInstance;
21using content::WebContents;
22
23namespace tab_util {
24
25content::WebContents* GetWebContentsByID(int render_process_id,
26                                         int render_view_id) {
27  RenderViewHost* render_view_host =
28      RenderViewHost::FromID(render_process_id, render_view_id);
29  if (!render_view_host)
30    return NULL;
31  return WebContents::FromRenderViewHost(render_view_host);
32}
33
34SiteInstance* GetSiteInstanceForNewTab(Profile* profile,
35                                       const GURL& url) {
36  // If |url| is a WebUI or extension, we set the SiteInstance up front so that
37  // we don't end up with an extra process swap on the first navigation.
38  if (ChromeWebUIControllerFactory::GetInstance()->UseWebUIForURL(profile, url))
39    return SiteInstance::CreateForURL(profile, url);
40
41#if defined(ENABLE_EXTENSIONS)
42   if (extensions::ExtensionRegistry::Get(
43       profile)->enabled_extensions().GetHostedAppByURL(url))
44     return SiteInstance::CreateForURL(profile, url);
45#endif
46
47  // We used to share the SiteInstance for same-site links opened in new tabs,
48  // to leverage the in-memory cache and reduce process creation.  It now
49  // appears that it is more useful to have such links open in a new process,
50  // so we create new tabs in a new BrowsingInstance.
51  return NULL;
52}
53
54}  // namespace tab_util
55