IndexedDB: IDL and tests for IDBObjectStore.getAllKeys().

Source/modules/indexeddb/IDBObjectStore.idl

Index: Source/modules/indexeddb/IDBObjectStore.idl
diff --git a/Source/modules/indexeddb/IDBObjectStore.idl b/Source/modules/indexeddb/IDBObjectStore.idl
index 6d0ef3a24b43e95640356a9afe220955f8528818..57ae7dcd84555ed41c5eb6af7851785d759719a2 100644
--- a/Source/modules/indexeddb/IDBObjectStore.idl
+++ b/Source/modules/indexeddb/IDBObjectStore.idl
@@ -42,6 +42,10 @@
     [CallWith=ScriptState, RaisesException] IDBRequest get(any key);
     // TODO(cmumford): 0xFFFFFFFF is not necessary. Remove once crbug.com/335871 is fixed.
     [CallWith=ScriptState, RaisesException, RuntimeEnabled=IndexedDBExperimental] IDBRequest getAll([Default=Undefined] optional any range, optional unsigned long maxCount = 0xFFFFFFFF);
+    // TODO(cmumford): Standardize or eventually remove. More info at:
+    // https://w3c.github.io/IndexedDB/#widl-IDBObjectStore-getAllKeys-IDBRequest-any-query-unsigned-long-count
+    // TODO(cmumford): 0xFFFFFFFF is not necessary. Remove once crbug.com/335871 is fixed.
+    [CallWith=ScriptState, RaisesException, RuntimeEnabled=IndexedDBExperimental] IDBRequest getAllKeys([Default=Undefined] optional any range, optional unsigned long maxCount = 0xFFFFFFFF);
     [CallWith=ScriptState, RaisesException] IDBRequest count([Default=Undefined] optional any key);
     [CallWith=ScriptState, RaisesException] IDBRequest openCursor([Default=Undefined] optional any range, optional IDBCursorDirection direction = "next");
     [CallWith=ScriptState, RaisesException, RuntimeEnabled=IndexedDBExperimental] IDBRequest openKeyCursor([Default=Undefined] optional any range, optional IDBCursorDirection direction = "next");