Make NSSCertDatabase::ListCerts work async on a worker thread.

net/cert/nss_cert_database_chromeos.cc

 // Copyright 2013 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 "net/cert/nss_cert_database_chromeos.h"
 
 #include <cert.h>
 #include <pk11pub.h>
 
+#include "base/bind.h"
+#include "base/callback.h"
+#include "base/location.h"
+#include "base/task_runner.h"
 #include "net/base/crypto_module.h"
 #include "net/cert/x509_certificate.h"
 
 namespace net {
 
 NSSCertDatabaseChromeOS::NSSCertDatabaseChromeOS(
     crypto::ScopedPK11Slot public_slot,
     crypto::ScopedPK11Slot private_slot)
     : public_slot_(public_slot.Pass()),
-      private_slot_(private_slot.Pass()) {
-  profile_filter_.Init(GetPublicSlot(), GetPrivateSlot());
+      private_slot_(private_slot.Pass()),
+      profile_filter_(new NSSProfileFilterChromeOS) {
+  profile_filter_->Init(GetPublicSlot(), GetPrivateSlot());
 }
 
 NSSCertDatabaseChromeOS::~NSSCertDatabaseChromeOS() {}
 
-void NSSCertDatabaseChromeOS::ListCerts(CertificateList* certs) {
-  NSSCertDatabase::ListCerts(certs);
+void NSSCertDatabaseChromeOS::ListCertsSync(CertificateList* certs) {
+  ListCertsImpl(profile_filter_, certs);
+}
 
-  size_t pre_size = certs->size();
-  certs->erase(std::remove_if(
-                   certs->begin(),
-                   certs->end(),
-                   NSSProfileFilterChromeOS::CertNotAllowedForProfilePredicate(
-                       profile_filter_)),
-               certs->end());
-  DVLOG(1) << "filtered " << pre_size - certs->size() << " of " << pre_size
-           << " certs";
+void NSSCertDatabaseChromeOS::ListCerts(
+    const base::Callback<void(scoped_ptr<CertificateList> certs)>& callback) {
+  scoped_ptr<CertificateList> certs(new CertificateList());
+  CertificateList* raw_certs = certs.get();
+
+  GetSlowTaskRunner()->PostTaskAndReply(
+      FROM_HERE,
+      base::Bind(&NSSCertDatabaseChromeOS::ListCertsImpl,
+                 profile_filter_,
+                 base::Unretained(raw_certs)),
+      base::Bind(callback, base::Passed(&certs)));
 }
 
 crypto::ScopedPK11Slot NSSCertDatabaseChromeOS::GetPublicSlot() const {
   return crypto::ScopedPK11Slot(
       public_slot_ ? PK11_ReferenceSlot(public_slot_.get()) : NULL);
 }
 
 crypto::ScopedPK11Slot NSSCertDatabaseChromeOS::GetPrivateSlot() const {
   return crypto::ScopedPK11Slot(
       private_slot_ ? PK11_ReferenceSlot(private_slot_.get()) : NULL);
 }
 
 void NSSCertDatabaseChromeOS::ListModules(CryptoModuleList* modules,
                                           bool need_rw) const {
   NSSCertDatabase::ListModules(modules, need_rw);
 
   size_t pre_size = modules->size();
   modules->erase(
       std::remove_if(
           modules->begin(),
           modules->end(),
           NSSProfileFilterChromeOS::ModuleNotAllowedForProfilePredicate(
               profile_filter_)),
       modules->end());
   DVLOG(1) << "filtered " << pre_size - modules->size() << " of " << pre_size
            << " modules";
 }
 
+void NSSCertDatabaseChromeOS::ListCertsImpl(
+      const scoped_refptr<NSSProfileFilterChromeOS> profile_filter,
+      CertificateList* certs) {
+  NSSCertDatabase::ListCertsImpl(certs);
+
+  size_t pre_size = certs->size();
+  certs->erase(std::remove_if(
+                   certs->begin(),
+                   certs->end(),
+                   NSSProfileFilterChromeOS::CertNotAllowedForProfilePredicate(
+                      profile_filter)),
+               certs->end());
+  DVLOG(1) << "filtered " << pre_size - certs->size() << " of " << pre_size
+           << " certs";
+}
+
 }  // namespace net