Reland "Add tests for JIT installable payment handlers."

This is a reland of 33a1a4b02fd1c7d7c623513274c24692d6602d8d

Original change's description:
> Add tests for JIT installable payment handlers.
>
> Bug: 872305
> Change-Id: I992e534ab0ca48affc14464c23af41a495209c58
> Reviewed-on: https://chromium-review.googlesource.com/1168084
> Reviewed-by: Ganggui Tang <gogerald@chromium.org>

TBR=gogerald@chromium.org

Bug: 872305
Change-Id: Icdf80a7bb92b53b85c09648bf483f1671fcfa662
Reviewed-on: https://chromium-review.googlesource.com/1172542Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Commit-Queue: Rouslan Solomakhin <rouslan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582597}

components/payments/core/test_payment_manifest_downloader.cc

@@ -19,14 +19,26 @@ TestDownloader::TestDownloader(
 
 TestDownloader::~TestDownloader() {}
 
+void TestDownloader::DownloadPaymentMethodManifest(
+    const GURL& url,
+    PaymentManifestDownloadCallback callback) {
+  PaymentManifestDownloader::DownloadPaymentMethodManifest(
+      FindTestServerURL(url), std::move(callback));
+}
+
+void TestDownloader::DownloadWebAppManifest(
+    const GURL& url,
+    PaymentManifestDownloadCallback callback) {
+  PaymentManifestDownloader::DownloadWebAppManifest(FindTestServerURL(url),
+                                                    std::move(callback));
+}
+
 void TestDownloader::AddTestServerURL(const std::string& prefix,
                                       const GURL& test_server_url) {
   test_server_url_[prefix] = test_server_url;
 }
 
-void TestDownloader::DownloadPaymentMethodManifest(
-    const GURL& url,
-    PaymentManifestDownloadCallback callback) {
+GURL TestDownloader::FindTestServerURL(const GURL& url) const {
   GURL actual_url = url;
 
   // Find the first key in |test_server_url_| that is a prefix of |url|. If
@@ -42,8 +54,7 @@ void TestDownloader::DownloadPaymentMethodManifest(
     }
   }
 
-  PaymentManifestDownloader::DownloadPaymentMethodManifest(actual_url,
-                                                           std::move(callback));
+  return actual_url;
 }
 
 }  // namespace payments

components/payments/core/test_payment_manifest_downloader.h

@@ -56,9 +56,13 @@ class TestDownloader : public PaymentManifestDownloader {
   void DownloadPaymentMethodManifest(
       const GURL& url,
       PaymentManifestDownloadCallback callback) override;
+  void DownloadWebAppManifest(
+      const GURL& url,
+      PaymentManifestDownloadCallback callback) override;
 
   // Modifies the downloader to replace all instances of |prefix| with
-  // |test_server_url| when downloading the payment method manifest.
+  // |test_server_url| when downloading payment method manifests and web app
+  // manifests.
   //
   // For example, if AddTestServerURL("https://", "https://127.0.0.1:7070") is
   // called, then all calls to DownloadPaymentMethodManifest(some_url, callback)
@@ -92,6 +96,8 @@ class TestDownloader : public PaymentManifestDownloader {
   void AddTestServerURL(const std::string& prefix, const GURL& test_server_url);
 
  private:
+  GURL FindTestServerURL(const GURL& url) const;
+
   // The mapping from the URL prefix to the URL of the test server to be used.
   // Example 1:
   //

components/test/data/payments/kylepay.com/app.js

+/*
+ * Copyright 2018 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.
+ */
+
+self.addEventListener('canmakepayment', (evt) => {
+  evt.respondWith(true);
+});
+
+self.addEventListener('paymentrequest', (evt) => {
+  evt.respondWith({
+    methodName: evt.methodData[0].supportedMethods,
+    details: {transactionId: '123'},
+  });
+});

components/test/data/payments/kylepay.com/app.json

+{
+  "name": "Pay with KylePay",
+  "short_name": "KylePay",
+  "icons": [{
+    "src": "icon.png",
+    "sizes": "48x48",
+    "type": "image/png"
+  }],
+  "serviceworker": {
+    "src": "app.js",
+    "use_cache": false,
+    "scope": "/webpay"
+  }
+}

components/test/data/payments/kylepay.com/payment-manifest.json

+{
+  "default_applications": ["https://kylepay.com/app.json"]
+}

components/test/data/payments/kylepay.com/webpay

+<!-- Intentionally blank. -->

components/test/data/payments/kylepay.com/webpay.mock-http-headers

+HTTP/1.1 200 OK
+Link: <payment-manifest.json>; rel="payment-method-manifest"