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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/tab_contents/tab_util.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/ui/webui/chrome_web_ui_controller_factory.h"
#include "content/public/browser/browser_url_handler.h"
#include "content/public/browser/site_instance.h"
#include "extensions/buildflags/buildflags.h"
#include "url/gurl.h"
#if BUILDFLAG(ENABLE_EXTENSIONS)
#include "extensions/browser/extension_registry.h"
#endif
using content::SiteInstance;
namespace tab_util {
scoped_refptr<SiteInstance> GetSiteInstanceForNewTab(Profile* profile,
GURL url) {
// Rewrite the |url| if necessary, to ensure that the SiteInstance is
// associated with a |url| that will actually be loaded. For example,
// |url| set to chrome://newtab/ might actually result in a navigation to a
// different URL like chrome://new-tab-page.
content::BrowserURLHandler::GetInstance()->RewriteURLIfNecessary(&url,
profile);
// If |url| is a WebUI or extension, we set the SiteInstance up front so that
// we don't end up with an extra process swap on the first navigation.
if (ChromeWebUIControllerFactory::GetInstance()->UseWebUIForURL(profile, url))
return SiteInstance::CreateForURL(profile, url);
#if BUILDFLAG(ENABLE_EXTENSIONS)
if (extensions::ExtensionRegistry::Get(profile)
->enabled_extensions()
.GetHostedAppByURL(url))
return SiteInstance::CreateForURL(profile, url);
#endif
// We used to share the SiteInstance for same-site links opened in new tabs,
// to leverage the in-memory cache and reduce process creation. It now
// appears that it is more useful to have such links open in a new process,
// so we create new tabs in a new BrowsingInstance.
// Create a new SiteInstance for the |url| unless it is not desirable.
if (!SiteInstance::ShouldAssignSiteForURL(url))
return nullptr;
return SiteInstance::CreateForURL(profile, url);
}
} // namespace tab_util
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