[IndexedDB] Use consistent enums on both sides of IPC.

public/platform/WebIDBTypes.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
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     WebIDBKeyPathTypeNull = 0,
     WebIDBKeyPathTypeString,
     WebIDBKeyPathTypeArray,
 };
 
 enum WebIDBDataLoss {
     WebIDBDataLossNone = 0,
     WebIDBDataLossTotal,
 };
 
+enum WebIDBCursorDirection {
+    WebIDBCursorDirectionNext = 0,
+    WebIDBCursorDirectionNextNoDuplicate = 1,
+    WebIDBCursorDirectionPrev = 2,
+    WebIDBCursorDirectionPrevNoDuplicate = 3,
+    WebIDBCursorDirectionLast = WebIDBCursorDirectionPrevNoDuplicate
+};
+
+enum WebIDBTaskType {
+    WebIDBTaskTypeNormal = 0,
+    WebIDBTaskTypePreemptive,
+    WebIDBTaskTypeLast = WebIDBTaskTypePreemptive
+};
+
+enum WebIDBPutMode {
+    WebIDBPutModeAddOrUpdate,
+    WebIDBPutModeAddOnly,
+    WebIDBPutModeCursorUpdate,
+    WebIDBPutModeLast = WebIDBPutModeCursorUpdate
+};
+
+enum WebIDBTransactionMode {
+    WebIDBTransactionModeReadOnly = 0,
+    WebIDBTransactionModeReadWrite,
+    WebIDBTransactionModeVersionChange,
+    WebIDBTransactionModeLast = WebIDBTransactionModeVersionChange
+};
+
 } // namespace blink
 
 #endif // WebIDBTypes_h