[Payments] Implement payment instrument icons

third_party/WebKit/Source/modules/payments/ImageObject.idl

Index: third_party/WebKit/Source/modules/payments/ImageObject.idl
diff --git a/third_party/WebKit/Source/modules/payments/ImageObject.idl b/third_party/WebKit/Source/modules/payments/ImageObject.idl
new file mode 100644
index 0000000000000000000000000000000000000000..ac8f460c1d3cb113ccf190286fa5d34843510bed
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+++ b/third_party/WebKit/Source/modules/payments/ImageObject.idl
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+// 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.
+
+// https://github.com/w3c/payment-handler/pull/174/files/6e6768c423e24719cb0e592cd98614f052e52a78
+
+dictionary ImageObject {
+    // Note that the src could be relative path to the service worker
+    // scope.
+    required USVString src;
+
+    // TODO(gogerald): Below two attributes have not been used for now.
+    // Enable them when necessary.
+    // DOMString sizes;
+    // DOMString type;
+};