Fix return value of Crypto#getRandomValues()

It should return the same array passed to it [1].

[1]: https://developer.mozilla.org/en-US/docs/Web/API/Crypto/getRandomValues#Return_value

Change-Id: I4d7095d762bc50f4d5170d61aad8440634bbe91e

src/tabris/Crypto.js

@@ -20,6 +20,7 @@ export default class Crypto extends NativeObject {
       throw new Error('Not enough random bytes available');
     }
     new Uint8Array(typedArray.buffer).set(values);
+    return typedArray;
   }
 
 }

test/tabris/Crypto.test.js

@@ -130,6 +130,13 @@ describe('Crypto', function() {
       expect(buffer[2]).to.equal(0xffffffff);
     });
 
+    it('returns given array', function() {
+      const buffer = new Uint32Array(3);
+      returnValue = new Uint8Array([0, 0, 0, 0, 0, 0, 0, 1, 255, 255, 255, 255]);
+
+      expect(crypto.getRandomValues(buffer)).to.equal(buffer);
+    });
+
   });
 
 });

typings/global/crypto.d.ts

@@ -1,9 +1,7 @@
-declare class Crypto {
-
-  getRandomValues(
-    typedArray: Int8Array | Uint8Array | Uint8ClampedArray | Int16Array | Uint16Array | Int32Array | Uint32Array
-  ): void;
+type TypedArray = Int8Array | Uint8Array | Uint8ClampedArray | Int16Array | Uint16Array | Int32Array | Uint32Array;
 
+declare class Crypto {
+  getRandomValues(typedArray: TypedArray): TypedArray;
 }
 
-declare var crypto: Crypto;
+declare var crypto: Crypto;