Add CtsSdkSandboxWebkitTestCases to WebView TEST_MAPPING.

Bug: 262697818
Test: atest --test-mapping frameworks/base/core/java/android/webkit
Change-Id: Id9d28a5156439985d63676f4e863bfa85868d4f9
diff --git a/native/webview/TEST_MAPPING b/native/webview/TEST_MAPPING
index bd25200..c1bc6d7 100644
--- a/native/webview/TEST_MAPPING
+++ b/native/webview/TEST_MAPPING
@@ -9,6 +9,14 @@
       ]
     },
     {
+      "name": "CtsSdkSandboxWebkitTestCases",
+      "options": [
+        {
+          "exclude-annotation": "androidx.test.filters.FlakyTest"
+        }
+      ]
+    },
+    {
       "name": "CtsHostsideWebViewTests",
       "options": [
         {