Add mouse scrollling speed slide bar

Bug: 383555305
Bug: 84795606
Test: Local DUT with aconfig flags enabled, verified slide bar
      appears and can be updated.
      Verified adjusting slide bar affects scrolling speed.
Flag: com.android.hardware.input.mouse_scrolling_acceleration
Change-Id: Ia66f88ce855ab152a161ef3f81ab643415fad517

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

@@ -0,0 +1,76 @@
+/*
+ * Copyright 2025 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 androidx.annotation.NonNull;
+import androidx.preference.PreferenceScreen;
+
+import com.android.settings.core.SliderPreferenceController;
+import com.android.settings.widget.SeekBarPreference;
+
+public class MouseScrollingSpeedPreferenceController extends SliderPreferenceController {
+
+    public MouseScrollingSpeedPreferenceController(@NonNull Context context, @NonNull String key) {
+        super(context, key);
+    }
+
+    @Override
+    public void displayPreference(@NonNull PreferenceScreen screen) {
+        super.displayPreference(screen);
+        SeekBarPreference preference = screen.findPreference(getPreferenceKey());
+        preference.setMax(getMax());
+        preference.setMin(getMin());
+        preference.setProgress(getSliderPosition());
+        updateState(preference);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        if (!InputSettings.isMouseScrollingAccelerationFeatureFlagEnabled()) {
+            return UNSUPPORTED_ON_DEVICE;
+        }
+        return AVAILABLE;
+    }
+
+    @Override
+    public boolean setSliderPosition(int position) {
+        if (position < getMin() || position > getMax()) {
+            return false;
+        }
+        InputSettings.setMouseScrollingSpeed(mContext, position);
+
+        return true;
+    }
+
+    @Override
+    public int getSliderPosition() {
+        return InputSettings.getMouseScrollingSpeed(mContext);
+    }
+
+    @Override
+    public int getMin() {
+        return InputSettings.MIN_MOUSE_SCROLLING_SPEED;
+    }
+
+    @Override
+    public int getMax() {
+        return InputSettings.MAX_MOUSE_SCROLLING_SPEED;
+    }
+}