Define EnumTraits for many IndexedDB enums.

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 CursorDirection;
+enum CursorDirection {
+  Next,
+  NextNoDuplicate,
+  Prev,
+  PrevNoDuplicate,
+};
 
-[Native]
-enum DataLoss;
+enum DataLoss {
+  None,
+  Total,
+};
 
 [Native]
 struct Key;
 
 [Native]
 struct KeyPath;
 
 [Native]
 struct KeyRange;
 
-[Native]
-enum PutMode;
+enum PutMode {
+  AddOrUpdate,
+  AddOnly,
+  CursorUpdate,
+};
 
-[Native]
-enum TaskType;
+enum TaskType {
+  Normal,
+  Preemptive,
+};
 
-[Native]
-enum TransactionMode;
+enum TransactionMode {
+  ReadOnly,
+  ReadWrite,
+  VersionChange,
+};
 
 struct IndexMetadata {
   int64 id;
   mojo.common.mojom.String16 name;
   KeyPath key_path;
   bool unique;
   bool multi_entry;
 };
 
 struct ObjectStoreMetadata {
@@ skipping 203 matching lines @@
 };
 
 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);
 };