Enable import/export of passwords into/from Password Manager

components/password_manager/core/browser/export/password_exporter.h

Index: components/password_manager/core/browser/export/password_exporter.h
diff --git a/components/password_manager/core/browser/export/password_exporter.h b/components/password_manager/core/browser/export/password_exporter.h
new file mode 100644
index 0000000000000000000000000000000000000000..5dcf3c076cfc63fc6e2b90b3c95bb63724a2328c
--- /dev/null
+++ b/components/password_manager/core/browser/export/password_exporter.h
@@ -0,0 +1,50 @@
+// Copyright 2016 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.
+
+#ifndef COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_EXPORT_PASSWORD_EXPORTER_H_
+#define COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_EXPORT_PASSWORD_EXPORTER_H_
+
+#include <string>
+#include <vector>
+
+#include "base/callback_forward.h"
+#include "base/files/file_path.h"
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+
+namespace autofill {
+struct PasswordForm;
+}
+
+namespace base {
+class FilePath;
+class TaskRunner;
+}
+
+namespace password_manager {
+
+class PasswordExporter {
+ public:
+  // Exports |passwords| into a file at |path|, overwriting any existing file,
+  // and fires |completion| on the calling thread when ready. Blocking IO tasks
+  // will be posted to |blocking_task_runner|. The format of the export will be
+  // selected based on the file extension in |path|.
+  static void Export(const base::FilePath& path,
+                     std::vector<scoped_ptr<autofill::PasswordForm>> passwords,
+                     scoped_refptr<base::TaskRunner> blocking_task_runner);
+
+  // Returns the file extensions corresponding to supported formats.
+  // Inner vector indicates equivalent extensions. For example:
+  //   { { "html", "htm" }, { "csv" } }
+  static std::vector<std::vector<base::FilePath::StringType>>
+  GetSupportedFileExtensions();
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(PasswordExporter);
+};
+
+}  // namespace password_manager
+
+#endif  // COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_EXPORT_PASSWORD_EXPORTER_H_