Tech debt cleanup: Consolidates A11yService warning dialog.

Both frameworks/base and the Settings app define almost-identical copies
of a warning dialog shown when enabling an accessibility service.
The frameworks/base version was used for contexts outside of Settings
(e.g. while editing the volume key shortcut after triggering it with
2+ features already enabled) while the Settings version was used in
the Settings app.

This change replaces version used in Settings with the version defined
in frameworks/base.

The warning dialog's functionality is tested in
AccessibilityServiceWarningTest in frameworks/base.

Feature flag:
`adb shell device_config override accessibility android.view.accessibility.deduplicate_accessibility_warning_dialog true`

Bug: 303511250
Test: atest AccessibilityServiceWarningTest
Test: existing A11ySettings robotests
Change-Id: Iad2f13040d53d82a4afb0353fae3ac355b5548d6

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

@@ -67,7 +67,11 @@ public class AccessibilityServiceWarning {
         void uninstallPackage();
     }
 
-    /** Returns a {@link Dialog} to be shown to confirm that they want to enable a service. */
+    /**
+     * Returns a {@link Dialog} to be shown to confirm that they want to enable a service.
+     * @deprecated Use {@link com.android.internal.accessibility.dialog.AccessibilityServiceWarning}
+     */
+    @Deprecated
     public static Dialog createCapabilitiesDialog(@NonNull Context context,
             @NonNull AccessibilityServiceInfo info, @NonNull View.OnClickListener listener,
             @NonNull UninstallActionPerformer performer) {

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

@@ -64,11 +64,26 @@ public class InvisibleToggleAccessibilityServicePreferenceFragment extends
     @Override
     void onDialogButtonFromShortcutToggleClicked(View view) {
         super.onDialogButtonFromShortcutToggleClicked(view);
+        if (!android.view.accessibility.Flags.deduplicateAccessibilityWarningDialog()) {
             if (view.getId() == R.id.permission_enable_allow_button) {
                 AccessibilityUtils.setAccessibilityServiceState(getContext(), mComponentName,
                         true);
             }
         }
+    }
+
+    /**
+     * {@inheritDoc}
+     *
+     * Enables accessibility service when user clicks permission allow button.
+     */
+    @Override
+    void onAllowButtonFromShortcutToggleClicked() {
+        super.onAllowButtonFromShortcutToggleClicked();
+        if (android.view.accessibility.Flags.deduplicateAccessibilityWarningDialog()) {
+            AccessibilityUtils.setAccessibilityServiceState(getContext(), mComponentName, true);
+        }
+    }
 
     /**
      * {@inheritDoc}

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

@@ -157,28 +157,55 @@ public class ToggleAccessibilityServicePreferenceFragment extends
                 if (info == null) {
                     return null;
                 }
+                if (android.view.accessibility.Flags.deduplicateAccessibilityWarningDialog()) {
+                    mWarningDialog =
+                            com.android.internal.accessibility.dialog.AccessibilityServiceWarning
+                                    .createAccessibilityServiceWarningDialog(getPrefContext(), info,
+                                            v -> onAllowButtonFromEnableToggleClicked(),
+                                            v -> onDenyButtonFromEnableToggleClicked(),
+                                            v -> onDialogButtonFromUninstallClicked());
+                } else {
                     mWarningDialog = AccessibilityServiceWarning
                             .createCapabilitiesDialog(getPrefContext(), info,
                                     this::onDialogButtonFromEnableToggleClicked,
                                     this::onDialogButtonFromUninstallClicked);
+                }
                 return mWarningDialog;
             case DialogEnums.ENABLE_WARNING_FROM_SHORTCUT_TOGGLE:
                 if (info == null) {
                     return null;
                 }
+                if (android.view.accessibility.Flags.deduplicateAccessibilityWarningDialog()) {
+                    mWarningDialog =
+                            com.android.internal.accessibility.dialog.AccessibilityServiceWarning
+                                    .createAccessibilityServiceWarningDialog(getPrefContext(), info,
+                                            v -> onAllowButtonFromShortcutToggleClicked(),
+                                            v -> onDenyButtonFromShortcutToggleClicked(),
+                                            v -> onDialogButtonFromUninstallClicked());
+                } else {
                     mWarningDialog = AccessibilityServiceWarning
                             .createCapabilitiesDialog(getPrefContext(), info,
                                     this::onDialogButtonFromShortcutToggleClicked,
                                     this::onDialogButtonFromUninstallClicked);
+                }
                 return mWarningDialog;
             case DialogEnums.ENABLE_WARNING_FROM_SHORTCUT:
                 if (info == null) {
                     return null;
                 }
+                if (android.view.accessibility.Flags.deduplicateAccessibilityWarningDialog()) {
+                    mWarningDialog =
+                            com.android.internal.accessibility.dialog.AccessibilityServiceWarning
+                                    .createAccessibilityServiceWarningDialog(getPrefContext(), info,
+                                            v -> onAllowButtonFromShortcutClicked(),
+                                            v -> onDenyButtonFromShortcutClicked(),
+                                            v -> onDialogButtonFromUninstallClicked());
+                } else {
                     mWarningDialog = AccessibilityServiceWarning
                             .createCapabilitiesDialog(getPrefContext(), info,
                                     this::onDialogButtonFromShortcutClicked,
                                     this::onDialogButtonFromUninstallClicked);
+                }
                 return mWarningDialog;
             case DialogEnums.DISABLE_WARNING_FROM_TOGGLE:
                 if (info == null) {
@@ -459,7 +486,7 @@ public class ToggleAccessibilityServicePreferenceFragment extends
         }
     }
 
-    private void onAllowButtonFromShortcutToggleClicked() {
+    void onAllowButtonFromShortcutToggleClicked() {
         mShortcutPreference.setChecked(true);
 
         final int shortcutTypes = retrieveUserShortcutType(getPrefContext(),