PaymentApp: Implement PaymentAppProvider for LayoutTest.

content/shell/renderer/layout_test/blink_test_runner.h

Index: content/shell/renderer/layout_test/blink_test_runner.h
diff --git a/content/shell/renderer/layout_test/blink_test_runner.h b/content/shell/renderer/layout_test/blink_test_runner.h
index 4d69a11e51243d78c4993ce506c0cc0174c6602f..d4f3d42b5c5ef852e5ee1df110077f2b9f8a3a11 100644
--- a/content/shell/renderer/layout_test/blink_test_runner.h
+++ b/content/shell/renderer/layout_test/blink_test_runner.h
@@ -18,6 +18,7 @@
 #include "content/public/renderer/render_view_observer.h"
 #include "content/public/renderer/render_view_observer_tracker.h"
 #include "content/shell/common/layout_test/layout_test_bluetooth_fake_adapter_setter.mojom.h"
+#include "content/shell/common/layout_test/layout_test_payment_app_provider.mojom.h"
 #include "content/shell/common/shell_test_configuration.h"
 #include "v8/include/v8.h"
 
@@ -121,6 +122,10 @@ class BlinkTestRunner : public RenderViewObserver,
       override;
   void SendBluetoothManualChooserEvent(const std::string& event,
                                        const std::string& argument) override;
+  void GetAllPaymentAppIDs(
+      const base::Callback<void(const std::vector<int64_t>&)>& callback)
+      override;
+  void InvokePaymentApp(int64_t registration_id) override;
   void SetFocus(blink::WebView* web_view, bool focus) override;
   void SetBlockThirdPartyCookies(bool block) override;
   std::string PathToLocalResource(const std::string& resource) override;
@@ -205,6 +210,9 @@ class BlinkTestRunner : public RenderViewObserver,
   GetBluetoothFakeAdapterSetter();
   mojom::LayoutTestBluetoothFakeAdapterSetterPtr bluetooth_fake_adapter_setter_;
 
+  mojom::LayoutTestPaymentAppProvider& GetPaymentAppProvider();
+  mojom::LayoutTestPaymentAppProviderPtr payment_app_provider_;
+
   test_runner::TestPreferences prefs_;
 
   ShellTestConfiguration test_config_;