Reland: Switch components/password_manager code from IPC messages to Mojo.

components/password_manager/content/public/interfaces/credential_manager.mojom

+// 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.
+
+module password_manager.mojom;
+
+import "url/mojo/origin.mojom";
+
+enum CredentialType {
+  EMPTY,
+  PASSWORD,
+  FEDERATED
+};
+
+enum CredentialManagerError {
+  SUCCESS,
+  DISABLED,
+  PENDINGREQUEST,
+  PASSWORDSTOREUNAVAILABLE,
+  UNKNOWN
+};
+
+struct CredentialInfo {
+  CredentialType type = EMPTY;
+  string id = "";
+  string name = "";
+  string icon = "";
+  string password = "";
+  url.mojom.Origin federation;
+};
+
+interface CredentialManager {
+  // Store credential. For navigator.credentials.store().
+  Store(CredentialInfo credential) => ();
+
+  // Require user mediation. For navigator.credentials.requireUserMediation().
+  RequireUserMediation() => ();
+
+  // Get Credential. For navigator.credentials.get().
+  // The result callback will return a non-null and valid CredentialInfo
+  // if succeeded, or null with a CredentialManagerError if failed.
+  Get(bool zero_click_only, bool include_passwords, array<string> federations)
+      => (CredentialManagerError error, CredentialInfo? credential);
+};