Scaffolding for Android implementation of PaymentRequest.

third_party/WebKit/public/BUILD.gn

Index: third_party/WebKit/public/BUILD.gn
diff --git a/third_party/WebKit/public/BUILD.gn b/third_party/WebKit/public/BUILD.gn
index adcf3dd8921bb41d747679f0355d277c80ed2e84..37bc00b00ee5039672a14e80eafdc2600aafbbd7 100644
--- a/third_party/WebKit/public/BUILD.gn
+++ b/third_party/WebKit/public/BUILD.gn
@@ -194,8 +194,16 @@ mojom("mojo_bindings") {
     "platform/modules/bluetooth/web_bluetooth.mojom",
     "platform/modules/geolocation/geolocation.mojom",
     "platform/modules/notifications/notification.mojom",
-    "platform/modules/payments/payment_request.mojom",
     "platform/modules/permissions/permission.mojom",
     "platform/modules/permissions/permission_status.mojom",
   ]
 }
+
+if (is_android) {
+  # GYP version: WebKit/public/blink.gyp:android_mojo_bindings_java
+  mojom("android_mojo_bindings") {
+    sources = [
+      "platform/modules/payments/payment_request.mojom",
+    ]
+  }
+}