[ExpandablePaymentHandler] Test UI appearance and user interaction

This CL adds test coverage for the appearance of the Expandable
Payment Handler UI and its user interaction.

Changes:
* Moved the original content of ExpandablePaymentHandlerTest.java into
ExpandablePaymentHandlerCoordinatorTest.java (and change to small-test).
* Added test cases in ExpandablePaymentHandlerTest.java.
* Changed payment method from "/pay" to the "payment_method.json".
This is because /pay was not pointing to a payment method manifest, so
JIT installation was disabled.
* merchant.html: given ids to the buttons so that the tests can
simulate users' clicking on the buttons.

Bug: 1042892, 1084705, 1084707, 1084708, 1084711, 1084721, 1068741

Change-Id: I4943932632cc446c75144bcdf7f9d9f9e06881be
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2227512Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Commit-Queue: Liquan (Max) Gu <maxlg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#775203}

chrome/android/chrome_test_java_sources.gni

@@ -327,6 +327,7 @@ chrome_test_java_sources = [
   "javatests/src/org/chromium/chrome/browser/payments/AndroidPaymentAppFinderTest.java",
   "javatests/src/org/chromium/chrome/browser/payments/CurrencyFormatterTest.java",
   "javatests/src/org/chromium/chrome/browser/payments/ExpandablePaymentHandlerChangePaymentMethodTest.java",
+  "javatests/src/org/chromium/chrome/browser/payments/ExpandablePaymentHandlerCoordinatorTest.java",
   "javatests/src/org/chromium/chrome/browser/payments/ExpandablePaymentHandlerTest.java",
   "javatests/src/org/chromium/chrome/browser/payments/IsReadyToPayServiceHelperTest.java",
   "javatests/src/org/chromium/chrome/browser/payments/MockPackageManagerDelegate.java",

chrome/android/javatests/src/org/chromium/chrome/browser/payments/ExpandablePaymentHandlerCoordinatorTest.java

+// Copyright 2020 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.
+
+package org.chromium.chrome.browser.payments;
+
+import android.support.test.filters.SmallTest;
+
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.chromium.base.test.util.CommandLineFlags;
+import org.chromium.base.test.util.Feature;
+import org.chromium.chrome.browser.ChromeActivity;
+import org.chromium.chrome.browser.flags.ChromeSwitches;
+import org.chromium.chrome.browser.payments.handler.PaymentHandlerCoordinator;
+import org.chromium.chrome.browser.payments.handler.PaymentHandlerCoordinator.PaymentHandlerUiObserver;
+import org.chromium.chrome.test.ChromeActivityTestRule;
+import org.chromium.chrome.test.ChromeJUnit4ClassRunner;
+import org.chromium.content_public.browser.test.util.Criteria;
+import org.chromium.content_public.browser.test.util.CriteriaHelper;
+import org.chromium.url.GURL;
+
+/**
+ * An integration test for {@link PaymentHandlerCoordinator}.
+ */
+@RunWith(ChromeJUnit4ClassRunner.class)
+@CommandLineFlags.Add({ChromeSwitches.DISABLE_FIRST_RUN_EXPERIENCE})
+public class ExpandablePaymentHandlerCoordinatorTest {
+    @Rule
+    public ChromeActivityTestRule<ChromeActivity> mRule =
+            new ChromeActivityTestRule<>(ChromeActivity.class);
+
+    private boolean mUiShown = false;
+
+    @Before
+    public void setUp() {
+        mRule.startMainActivityOnBlankPage();
+    }
+
+    @Test
+    @SmallTest
+    @Feature({"Payments"})
+    public void testShow() throws Throwable {
+        PaymentHandlerCoordinator paymentHandler = new PaymentHandlerCoordinator();
+        PaymentHandlerUiObserver uiObserver = new PaymentHandlerUiObserver() {
+            @Override
+            public void onPaymentHandlerUiClosed() {}
+
+            @Override
+            public void onPaymentHandlerUiShown() {
+                mUiShown = true;
+            }
+        };
+        mRule.runOnUiThread(
+                ()
+                        -> paymentHandler.show(mRule.getActivity(),
+                                new GURL("https://maxpay.com/pay"), /*isIncognito=*/false,
+                                /*webContentsObserver=*/(webContents) -> {}, uiObserver));
+        CriteriaHelper.pollInstrumentationThread(new Criteria() {
+            @Override
+            public boolean isSatisfied() {
+                return mUiShown;
+            }
+        });
+
+        mRule.runOnUiThread(() -> paymentHandler.hide());
+    }
+}
\ No newline at end of file

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

+{
+  "name": "Max Pay",
+  "icons": [{
+    "src": "../icon.png",
+    "sizes": "40x40",
+    "type": "image/png"
+  }],
+  "serviceworker": {
+    "src": "payment_handler_sw.js"
+  }
+}

components/test/data/payments/maxpay.com/installer.js

@@ -4,7 +4,8 @@
  * found in the LICENSE file.
  */
 
-const methodName = window.location.origin + '/pay';
+const methodName = window.location.origin +
+    '/components/test/data/payments/maxpay.com/payment_method.json';
 const swSrcUrl = './payment_handler_sw.js';
 let resultPromise;
 

components/test/data/payments/maxpay.com/merchant.html

@@ -47,9 +47,9 @@ found in the LICENSE file.
     </script>
     <h1>Use Max Pay</h1>
     <div id="controllers">
-      <button onclick="onInstallClicked()">Install</button>
-      <button onclick="onUninstallClicked()">Uninstall</button>
-      <button onclick="onLaunchClicked()">Launch</button>
+      <button id="install" onclick="onInstallClicked()">Install</button>
+      <button id="uninstall" onclick="onUninstallClicked()">Uninstall</button>
+      <button id="launch" onclick="onLaunchClicked()">Launch</button>
       <button onclick="onLaunchClicked('http://info.cern.ch')">Launch http app</button>
     </div>
     <div>

components/test/data/payments/maxpay.com/payment_handler_window.html

@@ -4,9 +4,13 @@ Copyright 2020 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.
 -->
-<meta
-  name="viewport"
-  content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1">
+<head>
+  <meta charset="utf-8">
+  <meta
+    name="viewport"
+    content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1">
+  <title>Max Pay</title>
+</head>
 <body>
   <button onclick="confirm()">confirm</button>
   <button onclick="cancel()">cancel</button>

components/test/data/payments/maxpay.com/payment_method.json

+{
+  "default_applications": ["app.json"]
+}