Strict definition for IDBDatabase.createObjectStore method
Strict definition for IDBDatabase.createObjectStore method

This PR is prerequisite for google/closure-compiler#2035.

See
https://www.w3.org/TR/IndexedDB/#idl-def-IDBDatabase
https://github.com/google/closure-compiler/pull/2035#issuecomment-286847194

Closes #818 from vobruba-martin/closure-library:indexeddb-createobjectstore

RELNOTES: n/a

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=154358908

google/closure-library,lucidsoftware/closure-library,platinumpixs/google-closure-library,lucidsoftware/closure-library,google/closure-library,teppeis/closure-library,teppeis/closure-library,ikabirov/closure-library,platinumpixs/google-closure-library,google/closure-library,platinumpixs/google-closure-library,lucidsoftware/closure-library,teppeis/closure-library,teppeis/closure-library,ikabirov/closure-library,google/closure-library,platinumpixs/google-closure-library,ikabirov/closure-library,ikabirov/closure-library,google/closure-library,lucidsoftware/closure-library