PaymentApp: Add interfaces for implementing InvokePaymentApp().

content/common/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//media/media_options.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//ppapi/features/features.gni")
 import("//sandbox/features.gni")
@@ skipping 336 matching lines @@
     "//ipc",
     "//third_party/WebKit/public:blink_headers",
   ]
   deps = [
     "//base",
     "//base/third_party/dynamic_annotations",
     "//build/util:webkit_version",
     "//cc/ipc",
     "//cc/surfaces",
     "//components/discardable_memory/common",
+    "//components/payments:payment_app",
     "//components/tracing",
     "//components/tracing:startup_tracing",
     "//content:resources",
     "//content/app/resources",
     "//device/base/synchronization",
     "//device/bluetooth",
     "//gpu",
     "//gpu/command_buffer/client:gles2_c_lib",
     "//gpu/command_buffer/client:gles2_cmd_helper",
     "//gpu/command_buffer/client:gles2_implementation",
@@ skipping 235 matching lines @@
     "//ui/gfx/geometry/mojo",
     "//ui/gfx/mojo",
     "//url/mojo:url_mojom_gurl",
     "//url/mojo:url_mojom_origin",
   ]
 
   export_class_attribute = "CONTENT_EXPORT"
   export_define = "CONTENT_IMPLEMENTATION=1"
   export_header = "content/common/content_export.h"
 }