[WebPayments] Start populating the Payment Sheet.

chrome/browser/payments/payment_request_impl.cc

Index: chrome/browser/payments/payment_request_impl.cc
diff --git a/chrome/browser/payments/payment_request_impl.cc b/chrome/browser/payments/payment_request_impl.cc
index 743ab19e26bf7dad196d9ced28889fdbc322523d..0d71ba96825a0794999b7b66efca525ad53bd44a 100644
--- a/chrome/browser/payments/payment_request_impl.cc
+++ b/chrome/browser/payments/payment_request_impl.cc
@@ -62,6 +62,7 @@ void PaymentRequestImpl::Init(
     payments::mojom::PaymentOptionsPtr options) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   client_ = std::move(client);
+  details_ = std::move(details);

[please use gerrit instead, 2017/01/04 15:55:27]

Run |details| through validatePaymentDetails(details, &error_message) first:

https://cs.chromium.org/chromium/src/components/payments/payment_details_vali...

This data comes from the renderer process, which the browser process should not
trust. If the |details| are invalid, disconnect from the client_ and binding_,
also destroy PaymentRequestImpl.

[anthonyvd, 2017/01/04 19:08:55]

Done.

 }
 
 void PaymentRequestImpl::Show() {