[WebLayer] Fix UnsatisfiedLinkError with weblayer shell

This forces the shell to be compatible with the support APK.

Change-Id: I44d7890385516cf01ea5fcf44fe12163c4b5f4c0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1790382
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Auto-Submit: Clark DuVall <cduvall@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694367}

weblayer/shell/android/BUILD.gn

@@ -54,6 +54,9 @@ android_apk("weblayer_shell_apk") {
   min_sdk_version = 21
   target_sdk_version = 28
   android_manifest_dep = ":weblayer_shell_manifest"
+
+  # Add a native lib so the ABI is compatible with the implementation APK.
+  native_lib_placeholders = [ "libdummy.so" ]
 }
 
 weblayer_support_manifest =