Move process-per-site logic from BrowsingInstance to RenderProcessHost.

content/browser/browsing_instance.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/browsing_instance.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "content/browser/site_instance_impl.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/content_browser_client.h"
-#include "content/public/browser/web_ui_controller_factory.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/url_constants.h"
 
 using content::SiteInstance;
-using content::WebUIControllerFactory;
-
-// static
-base::LazyInstance<BrowsingInstance::ContextSiteInstanceMap>::Leaky
-    BrowsingInstance::context_site_instance_map_ = LAZY_INSTANCE_INITIALIZER;
 
 BrowsingInstance::BrowsingInstance(content::BrowserContext* browser_context)
     : browser_context_(browser_context) {
 }
 
-bool BrowsingInstance::ShouldUseProcessPerSite(const GURL& url) {
-  // Returns true if we should use the process-per-site model.  This will be
-  // the case if the --process-per-site switch is specified, or in
-  // process-per-site-instance for particular sites (e.g., the new tab page).
-
-  const CommandLine& command_line = *CommandLine::ForCurrentProcess();
-  if (command_line.HasSwitch(switches::kProcessPerSite))
-    return true;
-
-  // We want to consolidate particular sites like extensions and WebUI whether
-  // it is in process-per-tab or process-per-site-instance.
-  // Note that --single-process may have been specified, but that affects the
-  // process creation logic in RenderProcessHost, so we do not need to worry
-  // about it here.
-
-  if (content::GetContentClient()->browser()->
-      ShouldUseProcessPerSite(browser_context_, url))
-    return true;
-
-  // DevTools pages have WebUI type but should not reuse the same host.
-  WebUIControllerFactory* factory =
-      content::GetContentClient()->browser()->GetWebUIControllerFactory();
-  if (factory && factory->UseWebUIForURL(browser_context_, url) &&
-      !url.SchemeIs(chrome::kChromeDevToolsScheme)) {
-    return true;
-  }
-
-  // In all other cases, don't use process-per-site logic.
-  return false;
-}
-
-BrowsingInstance::SiteInstanceMap* BrowsingInstance::GetSiteInstanceMap(
-    content::BrowserContext* browser_context, const GURL& url) {
-  if (!ShouldUseProcessPerSite(
-      SiteInstanceImpl::GetEffectiveURL(browser_context, url))) {
-    // Not using process-per-site, so use a map specific to this instance.
-    return &site_instance_map_;
-  }
-
-  // Otherwise, process-per-site is in use, at least for this URL.  Look up the
-  // global map for this context, creating an entry if necessary.
-  return &context_site_instance_map_.Get()[browser_context];
-}
-
 bool BrowsingInstance::HasSiteInstance(const GURL& url) {
   std::string site =
       SiteInstanceImpl::GetSiteForURL(browser_context_, url)
           .possibly_invalid_spec();
 
-  SiteInstanceMap* map = GetSiteInstanceMap(browser_context_, url);
-  SiteInstanceMap::iterator i = map->find(site);
-  return (i != map->end());
+  return site_instance_map_.find(site) != site_instance_map_.end();
 }
 
 SiteInstance* BrowsingInstance::GetSiteInstanceForURL(const GURL& url) {
   std::string site =
       SiteInstanceImpl::GetSiteForURL(browser_context_, url)
           .possibly_invalid_spec();
 
-  SiteInstanceMap* map = GetSiteInstanceMap(browser_context_, url);
-  SiteInstanceMap::iterator i = map->find(site);
-  if (i != map->end()) {
+  SiteInstanceMap::iterator i = site_instance_map_.find(site);
+  if (i != site_instance_map_.end())
     return i->second;
-  }
+
 
   // No current SiteInstance for this site, so let's create one.
   SiteInstanceImpl* instance = new SiteInstanceImpl(this);
 
   // Set the site of this new SiteInstance, which will register it with us.
   instance->SetSite(url);
   return instance;
 }
 
 void BrowsingInstance::RegisterSiteInstance(SiteInstance* site_instance) {
   DCHECK(static_cast<SiteInstanceImpl*>(site_instance)->
          browsing_instance_ == this);
   DCHECK(static_cast<SiteInstanceImpl*>(site_instance)->HasSite());
   std::string site = site_instance->GetSite().possibly_invalid_spec();
 
   // Only register if we don't have a SiteInstance for this site already.
   // It's possible to have two SiteInstances point to the same site if two
   // tabs are navigated there at the same time.  (We don't call SetSite or
   // register them until DidNavigate.)  If there is a previously existing
   // SiteInstance for this site, we just won't register the new one.
-  SiteInstanceMap* map = GetSiteInstanceMap(browser_context_,
-                                            site_instance->GetSite());
-  SiteInstanceMap::iterator i = map->find(site);
-  if (i == map->end()) {
+  SiteInstanceMap::iterator i = site_instance_map_.find(site);
+  if (i == site_instance_map_.end()) {
     // Not previously registered, so register it.
-    (*map)[site] = site_instance;
+    site_instance_map_[site] = site_instance;
   }
 }
 
 void BrowsingInstance::UnregisterSiteInstance(SiteInstance* site_instance) {
   DCHECK(static_cast<SiteInstanceImpl*>(site_instance)->
          browsing_instance_ == this);
   DCHECK(static_cast<SiteInstanceImpl*>(site_instance)->HasSite());
   std::string site = site_instance->GetSite().possibly_invalid_spec();
 
   // Only unregister the SiteInstance if it is the same one that is registered
   // for the site.  (It might have been an unregistered SiteInstance.  See the
   // comments in RegisterSiteInstance.)
-
-  // We look for the site instance in both the local site_instance_map_ and also
-  // the static context_site_instance_map_ - this is because the logic in
-  // ShouldUseProcessPerSite() can produce different results over the lifetime
-  // of Chrome (e.g. installation of apps with web extents can change our
-  // process-per-site policy for a given domain), so we don't know which map
-  // the site was put into when it was originally registered.
-  if (!RemoveSiteInstanceFromMap(&site_instance_map_, site, site_instance)) {
-    // Wasn't in our local map, so look in the static per-browser context map.
-    RemoveSiteInstanceFromMap(
-        &context_site_instance_map_.Get()[browser_context_],
-        site,
-        site_instance);
+  SiteInstanceMap::iterator i = site_instance_map_.find(site);
+  if (i != site_instance_map_.end() && i->second == site_instance) {
+    // Matches, so erase it.
+    site_instance_map_.erase(i);
   }
 }
 
-bool BrowsingInstance::RemoveSiteInstanceFromMap(
-    SiteInstanceMap* map,
-    const std::string& site,
-    SiteInstance* site_instance) {
-  SiteInstanceMap::iterator i = map->find(site);
-  if (i != map->end() && i->second == site_instance) {
-    // Matches, so erase it.
-    map->erase(i);
-    return true;
-  }
-  return false;
-}
-
 BrowsingInstance::~BrowsingInstance() {
   // We should only be deleted when all of the SiteInstances that refer to
   // us are gone.
   DCHECK(site_instance_map_.empty());
 }