Re: [browser-payment-api] How are payment requests and responses passed between the browser and third-party native wallets? (#50)

> Need to add a return data method.

The Android payment application will need to call its [Activity.setResult()](http://developer.android.com/reference/android/app/Activity.html#setResult(int)) method to pass payment response into Chrome. The payment response should be a string.

````Java
Intent result = new Intent("org.w3.intent.action.PAY");
result.putExtra("PaymentResponse", "{"
        + "  \"cardNumber\":       \"4111111111111111\","
        + "  \"cardholderName\":   \"Bob J. Paymentman\","
        + "  \"expiryYear\":       \"12\","
        + "  \"expiryYear\":       \"2016\","
        + "  \"cardSecurityCode\": \"123\""
        +"}");
setResult(Activity.RESULT_OK, result);
finish();
````

Chrome will parse this string into a JavaScript object and will use it to resolve the JavaScript promise returned from `PaymentRequest.show()`.



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