add @SystemApi to WEBVIEW_MULTIPROCESS to enable it to be used in WebView glue

Change-Id: Ib6431c4e4c2bcbcfc6f986f97fcf58ad5fa3dbc7
diff --git a/api/system-current.txt b/api/system-current.txt
index b36d7e8..081d60f 100644
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -34751,6 +34751,7 @@
     field public static final java.lang.String USB_MASS_STORAGE_ENABLED = "usb_mass_storage_enabled";
     field public static final java.lang.String USE_GOOGLE_MAIL = "use_google_mail";
     field public static final java.lang.String WAIT_FOR_DEBUGGER = "wait_for_debugger";
+    field public static final java.lang.String WEBVIEW_MULTIPROCESS = "webview_multiprocess";
     field public static final java.lang.String WIFI_DEVICE_OWNER_CONFIGS_LOCKDOWN = "wifi_device_owner_configs_lockdown";
     field public static final java.lang.String WIFI_MAX_DHCP_RETRY_COUNT = "wifi_max_dhcp_retry_count";
     field public static final java.lang.String WIFI_MOBILE_DATA_TRANSITION_WAKELOCK_TIMEOUT_MS = "wifi_mobile_data_transition_wakelock_timeout_ms";
diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index 770cde7..0074788 100755
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -7043,6 +7043,7 @@
          * Developer setting to enable WebView multiprocess rendering.
          * @hide
          */
+        @SystemApi
         public static final String WEBVIEW_MULTIPROCESS = "webview_multiprocess";
 
        /**