[wip] Introduce SiteInstanceKeepAlive.

content/browser/site_instance_impl.cc

 // Copyright (c) 2012 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 "content/browser/site_instance_impl.h"
 
 #include "base/command_line.h"
 #include "content/browser/browsing_instance.h"
 #include "content/browser/child_process_security_policy_impl.h"
 #include "content/browser/frame_host/debug_urls.h"
 #include "content/browser/renderer_host/render_process_host_impl.h"
 #include "content/browser/storage_partition_impl.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/browser/render_process_host_factory.h"
 #include "content/public/browser/web_ui_controller_factory.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/url_constants.h"
 #include "net/base/registry_controlled_domains/registry_controlled_domain.h"
 
 namespace content {
 
+SiteInstanceKeepAlive::SiteInstanceKeepAlive(
+    scoped_refptr<SiteInstanceImpl> instance)
+    : instance_(instance) {
+  instance_->increment_active_view_count();
+  instance_->GetProcess()->AddPendingView();
+}
+
+SiteInstanceKeepAlive::~SiteInstanceKeepAlive() {
+  instance_->GetProcess()->RemovePendingView();
+  instance_->decrement_active_view_count();
+}
+
 const RenderProcessHostFactory*
     SiteInstanceImpl::g_render_process_host_factory_ = NULL;
 int32 SiteInstanceImpl::next_site_instance_id_ = 1;
 
 SiteInstanceImpl::SiteInstanceImpl(BrowsingInstance* browsing_instance)
     : id_(next_site_instance_id_++),
       active_view_count_(0),
       browsing_instance_(browsing_instance),
       process_(NULL),
       has_site_(false) {
@@ skipping 176 matching lines @@
 
 void SiteInstanceImpl::set_render_process_host_factory(
     const RenderProcessHostFactory* rph_factory) {
   g_render_process_host_factory_ = rph_factory;
 }
 
 BrowserContext* SiteInstanceImpl::GetBrowserContext() const {
   return browsing_instance_->browser_context();
 }
 
+scoped_ptr<SiteInstanceKeepAlive> SiteInstanceImpl::AcquireKeepAlive() {
+  return make_scoped_ptr(new SiteInstanceKeepAlive(this));
+}
+
 /*static*/
 SiteInstance* SiteInstance::Create(BrowserContext* browser_context) {
   return new SiteInstanceImpl(new BrowsingInstance(browser_context));
 }
 
 /*static*/
 SiteInstance* SiteInstance::CreateForURL(BrowserContext* browser_context,
                                          const GURL& url) {
   // This BrowsingInstance may be deleted if it returns an existing
   // SiteInstance.
@@ skipping 95 matching lines @@
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
   if (command_line.HasSwitch(switches::kEnableStrictSiteIsolation) ||
       command_line.HasSwitch(switches::kSitePerProcess)) {
     ChildProcessSecurityPolicyImpl* policy =
         ChildProcessSecurityPolicyImpl::GetInstance();
     policy->LockToOrigin(process_->GetID(), site_);
   }
 }
 
 }  // namespace content