[WebPayments] A new PaymentRequestUI class, derived from Tab

This new class can be used to create instance of Tabs that can
handle PaymentHandler work-flow. The Client interface provides
an API to control the window's life-cycle.

Author: javifernandez

Diff for: wolvic/BUILD.gn

@@ -355,6 +355,7 @@ android_library("wolvic_java") {
     "java/org/chromium/wolvic/payments/WolvicPaymentRequestService.java",
     "java/org/chromium/wolvic/payments/WolvicPaymentResponseHelper.java",
     "java/org/chromium/wolvic/payments/ui/WolvicPaymentUiService.java",
+    "java/org/chromium/wolvic/payments/ui/PaymentRequestUI.java",
   ]
   srcjar_deps = [ ":jni_headers" ]
   deps = [

Diff for: wolvic/java/org/chromium/wolvic/Tab.java

@@ -86,22 +86,6 @@ public Tab(@NonNull Context context, boolean is_off_the_record, WebContents webC
         mWebContents.onShow();
     }
 
-    public static TabCompositorView createNewTab(@NonNull Context context, @NonNull WebContents webContents) {
-      // TODO(jfernandez): This code block is duplicated in Tabconstructor, so we may want to refactor it.
-      ActivityWindowAndroid windowAndroid = new ActivityWindowAndroid(context, false,
-             IntentRequestTracker.createFromActivity(ContextUtils.activityFromContext(context)));
-      TabCompositorView compositorView = new TabCompositorView(context);
-      compositorView.onNativeLibraryLoaded(windowAndroid);
-      windowAndroid.setAnimationPlaceholderView(compositorView);
-      ContentView webContentView =
-             ContentView.createContentView(
-                     context, /* eventOffsetHandler= */ null, webContents);
-      webContents.initialize("", ViewAndroidDelegate.createBasicDelegate(webContentView),
-                webContentView, windowAndroid, WebContents.createDefaultInternalsHolder());
-
-      return compositorView;
-    }
-
     public void destroy() {
         mWindowAndroid = null;
         mContentView = null;

Diff for: wolvic/java/org/chromium/wolvic/payments/ui/PaymentRequestUI.java

@@ -0,0 +1,40 @@
+package org.chromium.wolvic.payments.ui;
+
+import android.content.Context;
+
+import androidx.annotation.Nullable;
+import androidx.annotation.NonNull;
+
+import org.chromium.content_public.browser.WebContents;
+
+import org.chromium.wolvic.Tab;
+
+/** The PaymentRequest UI. */
+public class PaymentRequestUI extends Tab {
+
+    /** The interface to be implemented by the consumer of the PaymentRequest UI. */
+    public interface Client {
+
+        /**
+         * Called when the user dismisses the UI via clicking outsude the modal dialog.
+         */
+        void onDismiss();
+    }
+
+    private Client mClient;
+
+    public PaymentRequestUI(
+            @NonNull Context context,
+            @Nullable WebContents webContents,
+            @Nullable Client client) {
+      super(context, false, webContents);
+      mClient = client;
+    }
+
+    @Override
+    public void destroy() {
+      super.destroy();
+      if (mClient != null)
+        mClient.onDismiss();
+    }
+}