[Physical Keyboard][A11y Page] Add new Keyboard A11y page

Add new Keyboard A11y page, and controled with flag.
Demo video: b/345399212#comment6

Bug: 345399212
Test: atest SettingsRoboTests
Flag: com.android.settings.keyboard.keyboard_and_touchpad_a11y_new_page_enabled
Change-Id: I4bd45ff16c8abb33e1cf56c377ea86c20195fe26

src/com/android/settings/inputmethod/KeyboardAccessibilityBounceKeysController.java

@@ -0,0 +1,75 @@
+/*
+ * Copyright 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.inputmethod;
+
+import android.content.Context;
+import android.hardware.input.InputSettings;
+import android.net.Uri;
+import android.provider.Settings;
+
+import androidx.annotation.NonNull;
+import androidx.lifecycle.LifecycleObserver;
+
+import com.android.settings.R;
+
+public class KeyboardAccessibilityBounceKeysController extends
+        KeyboardAccessibilityController implements
+        LifecycleObserver {
+    public static final int BOUNCE_KEYS_THRESHOLD = 500;
+
+    public KeyboardAccessibilityBounceKeysController(@NonNull Context context,
+            @NonNull String key) {
+        super(context, key);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return (super.getAvailabilityStatus() == AVAILABLE)
+                && InputSettings.isAccessibilityBounceKeysFeatureEnabled() ? AVAILABLE
+                : UNSUPPORTED_ON_DEVICE;
+    }
+
+    @Override
+    public boolean isChecked() {
+        return InputSettings.isAccessibilityBounceKeysEnabled(mContext);
+    }
+
+    @Override
+    public boolean setChecked(boolean isChecked) {
+        InputSettings.setAccessibilityBounceKeysThreshold(mContext,
+                isChecked ? BOUNCE_KEYS_THRESHOLD : 0);
+        return true;
+    }
+
+    @NonNull
+    @Override
+    public CharSequence getSummary() {
+        return mContext.getString(R.string.bounce_keys_summary, BOUNCE_KEYS_THRESHOLD);
+    }
+
+    @Override
+    protected void updateKeyboardAccessibilitySettings() {
+        setChecked(
+                InputSettings.isAccessibilityBounceKeysEnabled(mContext));
+    }
+
+    @Override
+    protected Uri getSettingUri() {
+        return Settings.Secure.getUriFor(
+                Settings.Secure.ACCESSIBILITY_BOUNCE_KEYS);
+    }
+}