graphql / graphql-js / 3652

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Allows to add schema definition missing in the original schema (#1441)

Split out from #1438

Allows to inject directives and types into SDL-based schema:

```js
import { GrapQLDateTime } from 'somepackage';
let schema = new GraphQLSchema({
  types: [GrapQLDateTime],
});

const ast = parse(`
  type Query {
    timestamp: DateTime
  }
`);
schema = extendSchema(schema, ast);
```

```js
let schema = new GraphQLSchema({
  directives: [
    new GraphQLDirective({
      name: 'onSchema',
      locations: ['SCHEMA'],
    }),
  ],
});

const ast = parse(`
  schema @onSchema {
    query: Foo
  }
  type Foo {
    bar: String
  }
`);
schema = extendSchema(schema, ast);
```

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