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

public/platform/WebIDBTypes.h

Index: public/platform/WebIDBTypes.h
diff --git a/public/platform/WebIDBTypes.h b/public/platform/WebIDBTypes.h
index 7f8f7b12f1da809fbac5c4361c9479e4361a5974..06837b0d66b4ec91e9485117b51bd7c98e561ab3 100644
--- a/public/platform/WebIDBTypes.h
+++ b/public/platform/WebIDBTypes.h
@@ -50,6 +50,34 @@ enum WebIDBDataLoss {
     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