Allow embedder to use custom cryptography in Autofill table.

components/autofill/core/browser/webdata/autofill_table_encryptor_factory.cc

Index: components/autofill/core/browser/webdata/autofill_table_encryptor_factory.cc
diff --git a/components/autofill/core/browser/webdata/autofill_table_encryptor_factory.cc b/components/autofill/core/browser/webdata/autofill_table_encryptor_factory.cc
new file mode 100644
index 0000000000000000000000000000000000000000..6ee6516d1546d496fdbbc4c9579cbbc72777a402
--- /dev/null
+++ b/components/autofill/core/browser/webdata/autofill_table_encryptor_factory.cc
@@ -0,0 +1,33 @@
+// Copyright 2017 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 "components/autofill/core/browser/webdata/autofill_table_encryptor_factory.h"
+
+#include "base/memory/ptr_util.h"
+#include "base/memory/singleton.h"
+#include "components/autofill/core/browser/webdata/system_encryptor.h"
+
+namespace autofill {
+
+AutofillTableEncryptorFactory::AutofillTableEncryptorFactory() = default;
+
+AutofillTableEncryptorFactory::~AutofillTableEncryptorFactory() = default;
+
+AutofillTableEncryptorFactory* AutofillTableEncryptorFactory::GetInstance() {
+  return base::Singleton<AutofillTableEncryptorFactory>::get();
+}
+
+std::unique_ptr<AutofillTableEncryptor>
+AutofillTableEncryptorFactory::Create() {
+  DCHECK(sequence_checker_.CalledOnValidSequence());
+  return delegate_ ? delegate_->Create() : base::MakeUnique<SystemEncryptor>();
+}
+
+void AutofillTableEncryptorFactory::SetDelegate(
+    std::unique_ptr<Delegate> delegate) {
+  DCHECK(sequence_checker_.CalledOnValidSequence());
+  delegate_ = std::move(delegate);
+}
+
+}  // namespace autofill