Add secure setting for Global Actions Panel debug mode.

Changes grid-based power menu logic to use new debug setting.

Bug: 123397865
Bug: 127644235

Test: Automated tests pass. Manual testing turning off/on debug setting.
Change-Id: Ic95188bd10a433f5c58f0f37a098a872e65d8150
diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index de888d3..9c394bd 100644
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -6514,6 +6514,13 @@
                 "global_actions_panel_available";
 
         /**
+         * Enables debug mode for the Global Actions Panel.
+         * @hide
+         */
+        public static final String GLOBAL_ACTIONS_PANEL_DEBUG_ENABLED =
+                "global_actions_panel_debug_enabled";
+
+        /**
          * Whether the hush gesture has ever been used
          * @hide
          */
diff --git a/core/tests/coretests/src/android/provider/SettingsBackupTest.java b/core/tests/coretests/src/android/provider/SettingsBackupTest.java
index 9fa04ef..fda37c8 100644
--- a/core/tests/coretests/src/android/provider/SettingsBackupTest.java
+++ b/core/tests/coretests/src/android/provider/SettingsBackupTest.java
@@ -637,6 +637,7 @@
                  Settings.Secure.ENABLED_NOTIFICATION_POLICY_ACCESS_PACKAGES,
                  Settings.Secure.ENABLED_PRINT_SERVICES,
                  Settings.Secure.GLOBAL_ACTIONS_PANEL_AVAILABLE,
+                 Settings.Secure.GLOBAL_ACTIONS_PANEL_DEBUG_ENABLED,
                  Settings.Secure.IMMERSIVE_MODE_CONFIRMATIONS,
                  Settings.Secure.INCALL_BACK_BUTTON_BEHAVIOR,
                  Settings.Secure.INPUT_METHOD_SELECTOR_VISIBILITY,