Fix missing declared accessibility PreferenceControllers.

This includes 3 fixes:

Adds missing settings:controller attribute for bold & high-contrast
text preferences.

Separates VibrationSettings into two fragments, one per fragment XML resource.
  Instead of using a conditional to choose the XML resource ID,
  we now use the conditional to choose which fragment to launch.
  This allows both fragment's preference controllers to be inspected
  by CodeInspectionTest#runSliceControllerInXmlInspection.
  Also updates the preference keys which must be unique per XML in order
  to appear in Settings Search.

Adds Magnification preference controllers to exempt-not-in-XML list.
  These controllers are for fragments that are not declared in an XML.
  See ToggleScreenMagnificationPreferenceFragment
        #getPreferenceScreenResId.

Bug: 289967175
Test: atest SettingsRoboTests:com.android.settings.accessibility
Test: atest CodeInspectionTest#runSliceControllerInXmlInspection;
      Observe no errors in the accessibility package.
Test: Open Settings > Accessibility > Vibration & haptics;
      observe vibration intensity page is shown (behavior unchanged).
      Hardcode config_vibration_supported_intensity_levels=1;
      observe vibration page with toggles is shown (behavior unchanged).
Change-Id: I257b5ad390371bedb1623af6289016b06d478707

src/com/android/settings/accessibility/VibrationSettings.java

@@ -26,10 +26,12 @@ import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 
+import androidx.annotation.VisibleForTesting;
 import androidx.recyclerview.widget.RecyclerView;
 
 import com.android.settings.R;
 import com.android.settings.dashboard.DashboardFragment;
+import com.android.settings.flags.Flags;
 import com.android.settings.search.BaseSearchIndexProvider;
 import com.android.settingslib.search.SearchIndexable;
 
@@ -43,6 +45,9 @@ public class VibrationSettings extends DashboardFragment {
     private static final String TAG = "VibrationSettings";
 
     private static int getVibrationXmlResourceId(Context context) {
+        if (Flags.separateAccessibilityVibrationSettingsFragments()) {
+            return R.xml.accessibility_vibration_settings;
+        }
         final int supportedIntensities = context.getResources().getInteger(
                 R.integer.config_vibration_supported_intensity_levels);
         return supportedIntensities > 1
@@ -74,6 +79,9 @@ public class VibrationSettings extends DashboardFragment {
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
             Bundle savedInstanceState) {
+        if (Flags.separateAccessibilityVibrationSettingsFragments()) {
+            return super.onCreateView(inflater, container, savedInstanceState);
+        }
         final View view = super.onCreateView(inflater, container, savedInstanceState);
         final RecyclerView rv = getListView();
         final Resources res = view.getResources();
@@ -88,12 +96,23 @@ public class VibrationSettings extends DashboardFragment {
         return view;
     }
 
+    @VisibleForTesting
+    static boolean isPageSearchEnabled(Context context) {
+        final int supportedIntensityLevels = context.getResources().getInteger(
+                R.integer.config_vibration_supported_intensity_levels);
+        final boolean hasVibrator = context.getSystemService(Vibrator.class).hasVibrator();
+        if (Flags.separateAccessibilityVibrationSettingsFragments()) {
+            return hasVibrator && supportedIntensityLevels == 1;
+        } else {
+            return hasVibrator;
+        }
+    }
+
     public static final BaseSearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
             new BaseSearchIndexProvider() {
-
                 @Override
                 protected boolean isPageSearchEnabled(Context context) {
-                    return context.getSystemService(Vibrator.class).hasVibrator();
+                    return VibrationSettings.isPageSearchEnabled(context);
                 }
 
                 @Override