Tell IDB frontend about data loss

content/common/indexed_db/indexed_db_messages.h

 // Copyright (c) 2012 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.
 
 // Message definition file, included multiple times, hence no include guard.
 
 #include <vector>
 
 #include "content/common/indexed_db/indexed_db_key.h"
 #include "content/common/indexed_db/indexed_db_key_path.h"
@@ skipping 269 matching lines @@
   IPC_STRUCT_MEMBER(int64, max_object_store_id)
   IPC_STRUCT_MEMBER(std::vector<IndexedDBObjectStoreMetadata>, object_stores)
 IPC_STRUCT_END()
 
 IPC_STRUCT_BEGIN(IndexedDBMsg_CallbacksUpgradeNeeded_Params)
   IPC_STRUCT_MEMBER(int32, ipc_thread_id)
   IPC_STRUCT_MEMBER(int32, ipc_callbacks_id)
   IPC_STRUCT_MEMBER(int32, ipc_database_callbacks_id)
   IPC_STRUCT_MEMBER(int32, ipc_database_id)
   IPC_STRUCT_MEMBER(int64, old_version)
+  IPC_STRUCT_MEMBER(int32, data_loss)

[aedla, 2013/06/19 10:56:51]

Could this be sent as WebKit::WebIDBCallbacks::DataLoss instead?

And then registered as
IPC_ENUM_TRAITS_MAX_VALUE(WebKit::WebIDBDatabase::TaskType,
                          WebKit::WebIDBDatabase::DataLossTotal)

Then the enum will be validated by the receiver. On a browser -> renderer
message it doesn't matter much, but we're trying move in the direction where all
enums are validated across IPC. IPC_ENUM_TRAITS is now deprecated.

   IPC_STRUCT_MEMBER(IndexedDBDatabaseMetadata, idb_metadata)
 IPC_STRUCT_END()
 
 // Indexed DB messages sent from the browser to the renderer.
 
 // The thread_id needs to be the first parameter in these messages.  In the IO
 // thread on the renderer/client process, an IDB message filter assumes the
 // thread_id is the first int.
 
 // IDBCallback message handlers.
@@ skipping 195 matching lines @@
 
 // WebIDBDatabase::commit() message.
 IPC_MESSAGE_CONTROL2(IndexedDBHostMsg_DatabaseCommit,
                      int32, /* ipc_database_id */
                      int64) /* transaction_id */
 
 // WebIDBDatabase::~WebIDBCursor() message.
 IPC_MESSAGE_CONTROL1(IndexedDBHostMsg_CursorDestroyed,
                      int32 /* ipc_cursor_id */)