tab_util.cc revision 116680a4aac90f2aa7413d9095a592090648e557 
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 "extensions/browser/extension_registry.h"
14#include "url/gurl.h"
15
16using content::RenderViewHost;
17using content::SiteInstance;
18using content::WebContents;
19
20namespace tab_util {
21
22content::WebContents* GetWebContentsByID(int render_process_id,
23                                         int render_view_id) {
24  RenderViewHost* render_view_host =
25      RenderViewHost::FromID(render_process_id, render_view_id);
26  if (!render_view_host)
27    return NULL;
28  return WebContents::FromRenderViewHost(render_view_host);
29}
30
31SiteInstance* GetSiteInstanceForNewTab(Profile* profile,
32                                       const GURL& url) {
33  // If |url| is a WebUI or extension, we set the SiteInstance up front so that
34  // we don't end up with an extra process swap on the first navigation.
35  if (ChromeWebUIControllerFactory::GetInstance()->UseWebUIForURL(
36          profile, url) ||
37      extensions::ExtensionRegistry::Get(
38          profile)->enabled_extensions().GetHostedAppByURL(url)) {
39    return SiteInstance::CreateForURL(profile, url);
40  }
41
42  // We used to share the SiteInstance for same-site links opened in new tabs,
43  // to leverage the in-memory cache and reduce process creation.  It now
44  // appears that it is more useful to have such links open in a new process,
45  // so we create new tabs in a new BrowsingInstance.
46  return NULL;
47}
48
49}  // namespace tab_util
50