Add missing AR test data entry

Adds a missing data entry to the chrome_test_ar_java target that was
causing the bot that runs the test to fail due to being unable to find
the ArCore APK.

TBR=agrieve@chromium.org

Bug: 851020
Change-Id: Ib96b57fe46a7e2ef73501d98deb5eacaa71cead3
Reviewed-on: https://chromium-review.googlesource.com/1155155Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579081}

chrome/android/BUILD.gn

@@ -792,6 +792,10 @@ if (enable_vr || (enable_arcore && package_arcore)) {
 
       deps =
           chrome_test_xr_java_deps + [ "//chrome/android:chrome_test_xr_java" ]
+
+      data = [
+        "//third_party/arcore-android-sdk/test-apks/",
+      ]
     }
   }
 }