Port messages sent by WebIDBFactoryImpl to Mojo.

content/common/indexed_db/indexed_db.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.
+
+// TODO: This will move to //third_party/WebKit when //content/child/indexed_db
+// is deleted but for now this will depend on //content/common types and so
+// so belongs here.
+
+module indexed_db.mojom;
+
+import "mojo/common/common_custom_types.mojom";
+import "url/mojo/origin.mojom";
+
+[Native]
+enum DataLoss;
+
+[Native]
+struct KeyPath;
+
+struct IndexMetadata {
+  int64 id;
+  mojo.common.mojom.String16 name;
+  KeyPath key_path;
+  bool unique;
+  bool multi_entry;
+};
+
+struct ObjectStoreMetadata {
+  int64 id;
+  mojo.common.mojom.String16 name;
+  KeyPath key_path;
+  bool auto_increment;
+  int64 max_index_id;
+  array<IndexMetadata> indexes;
+};
+
+struct DatabaseMetadata {
+  int64 id;
+  mojo.common.mojom.String16 name;
+  int64 version;
+  int64 max_object_store_id;
+  array<ObjectStoreMetadata> object_stores;
+};
+
+interface Callbacks {
+  Error(int32 code, mojo.common.mojom.String16 message);
+
+  // Factory::GetDatabaseNames
+  SuccessStringList(array<mojo.common.mojom.String16> value);
+
+  // Factory::Open / DeleteDatabase
+  Blocked(int64 existing_version);
+
+  // Factory::Open
+  UpgradeNeeded(int32 database_id, int64 old_version, DataLoss data_loss,
+                string data_loss_message, DatabaseMetadata db_metadata);
+  SuccessDatabase(int32 database_id, DatabaseMetadata metadata);
+
+  // Factory::DeleteDatabase
+  SuccessInteger(int64 value);
+};
+
+interface DatabaseCallbacks {

[dcheng, 2016/10/17 05:33:44]

Mind documenting the Callbacks and DatabaseCallbacks interfaces a bit? Callbacks
and DatabaseCallbacks are pretty generic names. I'm not sure if |Callbacks| and
|DatabaseCallbacks| correspond to something in the IndexedDB spec, but if they
do, it would be nice to have a pointer here as well.

[Reilly Grant (use Gerrit), 2016/10/19 00:36:51]

The fact that these are just two large interfaces is more of a quirk of how
IndexedDB was implemented on top of legacy IPC. I've added top-level comments to
the interfaces and a TODO to try to convert as many messages as possible to use
Mojo replies instead of taking a generic Callbacks interface.

+  ForcedClose();
+  VersionChange(int64 old_version, int64 new_version);
+  Abort(int64 transaction_id, int32 code,
+        mojo.common.mojom.String16 message);
+  Complete(int64 transaction_id);
+};
+
+interface Factory {
+  GetDatabaseNames(associated Callbacks callbacks, url.mojom.Origin origin);
+  Open(int32 worker_thread, associated Callbacks callbacks,
+       associated DatabaseCallbacks database_callbacks, url.mojom.Origin origin,
+       mojo.common.mojom.String16 name, int64 version, int64 transaction_id);
+  DeleteDatabase(associated Callbacks callbacks, url.mojom.Origin origin,
+                 mojo.common.mojom.String16 name);
+};