Add webkit to hwasan-postsubmit

Test: Run tests under HWASan.
Bug: 193568145
Change-Id: I175762c412f618f219aef598e73ee44c1e78b564
diff --git a/hostsidetests/webkit/TEST_MAPPING b/hostsidetests/webkit/TEST_MAPPING
index fcd8ab5..27c686e 100644
--- a/hostsidetests/webkit/TEST_MAPPING
+++ b/hostsidetests/webkit/TEST_MAPPING
@@ -3,5 +3,10 @@
     {
       "name": "CtsHostsideWebViewTests"
     }
+  ],
+  "hwasan-postsubmit": [
+    {
+      "name": "CtsHostsideWebViewTests"
+    }
   ]
 }