Revert of Credit card editor for PaymentRequest UI.

chrome/android/java/src/org/chromium/chrome/browser/preferences/autofill/AutofillLocalCardEditor.java

Index: chrome/android/java/src/org/chromium/chrome/browser/preferences/autofill/AutofillLocalCardEditor.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/preferences/autofill/AutofillLocalCardEditor.java b/chrome/android/java/src/org/chromium/chrome/browser/preferences/autofill/AutofillLocalCardEditor.java
index 8c642db4c17b4606ff57c9b54516f8b0cae0841e..9971acc9941d6e66c9c1adb6ad6862f2672baf8a 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/preferences/autofill/AutofillLocalCardEditor.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/preferences/autofill/AutofillLocalCardEditor.java
@@ -5,7 +5,9 @@
 package org.chromium.chrome.browser.preferences.autofill;
 
 import android.os.Bundle;
+import android.text.Editable;
 import android.text.TextUtils;
+import android.text.TextWatcher;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -195,4 +197,94 @@
                 || !TextUtils.isEmpty(mNumberText.getText());
         ((Button) getView().findViewById(R.id.button_primary)).setEnabled(enabled);
     }
+
+    /**
+     * Watch a TextView and if a credit card number is entered, it will format the number.
+     * Disable formatting when user:
+     * 1. Inputs dashes or spaces.
+     * 2. Removes separators in the middle of the string
+     * 3. Enters a number longer than 16 digits.
+     *
+     * Formatting will be re-enabled once text is cleared.
+     */
+    private static class CreditCardNumberFormattingTextWatcher implements TextWatcher {
+        /** Character for card number section separator. */
+        private static final String SEPARATOR = " ";
+
+        /**
+         * Whether to format the credit card number. If true, spaces will be inserted
+         * automatically between each group of 4 digits in the credit card number as the user types.
+         * This is set to false if the user types a dash or deletes one of the auto-inserted spaces.
+         */
+        private boolean mFormattingEnabled = true;
+
+        /**
+         * Whether the change was caused by ourselves.
+         * This is set true when we are manipulating the text of EditText,
+         * and all callback functions should check this boolean to avoid infinite recursion.
+         */
+        private boolean mSelfChange = false;
+
+        @Override
+        public void onTextChanged(CharSequence s, int start, int before, int count) {
+            if (mSelfChange || !mFormattingEnabled) return;
+            // If user enters non-digit characters, do not format.
+            if (count > 0 && hasDashOrSpace(s, start, count)) {
+                mFormattingEnabled = false;
+            }
+        }
+
+        @Override
+        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
+            if (mSelfChange || !mFormattingEnabled) return;
+            // If user deletes non-digit characters, do not format.
+            if (count > 0 && hasDashOrSpace(s, start, count)) {
+                mFormattingEnabled = false;
+            }
+        }
+
+        @Override
+        public void afterTextChanged(Editable s) {
+            if (mSelfChange) return;
+            mSelfChange = true;
+
+            if (mFormattingEnabled) {
+                removeSeparators(s);
+                // If number is too long, do not format it and remove all
+                // previous separators.
+                if (s.length() > 16) {
+                    mFormattingEnabled = false;
+                } else {
+                    insertSeparators(s);
+                }
+            }
+            // If user clears the input, re-enable formatting
+            if (s.length() == 0) mFormattingEnabled = true;
+
+            mSelfChange = false;
+        }
+
+        public static void removeSeparators(Editable s) {
+            int index = TextUtils.indexOf(s, SEPARATOR);
+            while (index >= 0) {
+                s.delete(index, index + 1);
+                index = TextUtils.indexOf(s, SEPARATOR, index + 1);
+            }
+        }
+
+        public static void insertSeparators(Editable s) {
+            final int[] positions = {4, 9, 14 };
+            for (int i : positions) {
+                if (s.length() > i) {
+                    s.insert(i, SEPARATOR);
+                }
+            }
+        }
+
+        public static boolean hasDashOrSpace(final CharSequence s, final int start,
+                final int count) {
+            return TextUtils.indexOf(s, " ", start, start + count) != -1
+                    || TextUtils.indexOf(s, "-", start, start + count) != -1;
+        }
+    }
 }