PaymentHandler: Implement GetAllPaymentApps().

content/public/browser/payment_instrument.cc

Index: content/public/browser/payment_instrument.cc
diff --git a/content/public/browser/payment_instrument.cc b/content/public/browser/payment_instrument.cc
new file mode 100644
index 0000000000000000000000000000000000000000..5a1d8d5d3785c244a39c5637758418b005410488
--- /dev/null
+++ b/content/public/browser/payment_instrument.cc
@@ -0,0 +1,13 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/public/browser/payment_instrument.h"
+
+namespace content {
+
+PaymentInstrument::PaymentInstrument() = default;

[please use gerrit instead, 2017/05/10 19:49:17]

Please initialize the registration_id to 0. Otherwise it's random.

[zino, 2017/05/11 01:29:57]

Done.

+
+PaymentInstrument::~PaymentInstrument() = default;
+
+}  // namespace content