Adding missing build dependency in search_engines

Generated code used a header the build target doesn't depend
on. This extracts that file to its own target so that
the "prepopulated_engines" can depend on that target.

This was found with an updated gn that also checks dependencies
for generated files (an understandable limitation in previous gn).

Bug: 655123
Change-Id: I4bee2a906c2e5c925db549e6bfa0be971afa3828
Commit-Queue: Daniel Bratell <>
Reviewed-by: Mark Pearson <>
Reviewed-by: Bruce Dawson <>
Cr-Commit-Position: refs/heads/master@{#642620}
2 files changed