[Merge M-53] Credit card editor for PaymentRequest UI.

chrome/android/java/src/org/chromium/chrome/browser/payments/ui/Validatable.java

Index: chrome/android/java/src/org/chromium/chrome/browser/payments/ui/Validatable.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/payments/ui/Validatable.java b/chrome/android/java/src/org/chromium/chrome/browser/payments/ui/Validatable.java
new file mode 100644
index 0000000000000000000000000000000000000000..3f5dd0fe03ee779c5c5798c3192a863123e8d294
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/payments/ui/Validatable.java
@@ -0,0 +1,21 @@
+// Copyright 2016 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.ui;
+
+/** The interface for editor fields that handle validation and display of errors. */
+interface Validatable {
+    /**
+     * Updates the error display.
+     *
+     * @param showError If true, displays the error message.  If false, clears it.
+     */
+    void updateDisplayedError(boolean showError);
+
+    /** @return True if this field is valid. */
+    boolean isValid();
+
+    /** Scrolls to and focuses the field to bring user's attention to it. */
+    void scrollToAndFocus();
+}