IndexedDB: Protect against key prefix overflows
https://bugs.webkit.org/show_bug.cgi?id=111138

Reviewed by Tony Chang.

Source/WebCore:

This reworks the boundary checking for all databaseId,
objectStoreId, and indexId, including negative and
zero-based ids. All entrypoints into IDBLevelDBCoding
are protected with explicit checks and all internal
uses of KeyPrefix are protected with ASSERTs in the
various constructors.

Tests: WebKit unit tests IDBBackingStoreTest.cpp in WebKit/chromium

* Modules/indexeddb/IDBBackingStore.h: Make all public methods boolean-based for errors.
* Modules/indexeddb/IDBLevelDBCoding.h: Add methods for checking databaseId, objectStoreId, and indexId.

Source/WebKit/chromium:

Add tests for invalid indexIds in basic get/put operations.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@145375 268f45cc-cd09-0410-ab3c-d52691b4dbfc