Move feature-level Bubble setting into developer options; default to off

Functionality:
* Moves feature-level setting into developer settings (apps section)
* Adds bubbles in developer options under "apps" section
* Configures the app-specific bubble toggle in notifications settings
  to be hidden / shown based on the developer setting
* Configures the channel-specific bubble toggle in notification channel
  settings to be hidden / shown based on the developer setting

Tests:
* Anything that might be assuming that it's globally enabled now has
  a bit to enable it globally in that test
* There is a logic change now where the app-level setting would be available
  even if off globally, now that is not true -- if it's off globally the
  app-level is no longer available
* Adds tests for the developer setting

Test: make -j40 RunSettingsRoboTests ROBOTEST_FILTER="Bubble"
Bug: 131845765
Change-Id: I5f6bf74e5ada3fc023571825cca10d7bddc60e6e

src/com/android/settings/development/BubbleGlobalPreferenceController.java

@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2019 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.development;
+
+import static android.provider.Settings.Secure.NOTIFICATION_BUBBLES;
+
+import android.content.Context;
+import android.provider.Settings;
+
+import androidx.annotation.VisibleForTesting;
+import androidx.preference.Preference;
+import androidx.preference.SwitchPreference;
+
+import com.android.settings.core.PreferenceControllerMixin;
+import com.android.settingslib.development.DeveloperOptionsPreferenceController;
+
+public class BubbleGlobalPreferenceController extends DeveloperOptionsPreferenceController
+        implements Preference.OnPreferenceChangeListener, PreferenceControllerMixin {
+
+    @VisibleForTesting
+    static final int ON = 1;
+    @VisibleForTesting
+    static final int OFF = 0;
+
+    public BubbleGlobalPreferenceController(Context context) {
+        super(context);
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return NOTIFICATION_BUBBLES;
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        writeSetting((boolean) newValue);
+        return true;
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        ((SwitchPreference) mPreference).setChecked(isEnabled());
+    }
+
+    @Override
+    protected void onDeveloperOptionsSwitchDisabled() {
+        super.onDeveloperOptionsSwitchDisabled();
+        writeSetting(false /* isEnabled */);
+        updateState(mPreference);
+    }
+
+    private boolean isEnabled() {
+        return Settings.Secure.getInt(mContext.getContentResolver(),
+                NOTIFICATION_BUBBLES, OFF) == ON;
+    }
+
+    private void writeSetting(boolean isEnabled) {
+        Settings.Secure.putInt(mContext.getContentResolver(),
+                NOTIFICATION_BUBBLES, isEnabled ? ON : OFF);
+    }
+}