GitLab

Add additional templates to compiled .appiconset and .launchimage
asset catalog types and rename the file defining the templates to
build/config/ios/asset_catalog.gni.

Leave a forwarding .gni named build/config/ios/imageset.gni as the
downstream code still reference this path. The file will be removed
in a followup CL once the downstream code has been fixed to use the
new path.

TBR=yuweih@chromium.org (for remoting/ios/app/resources/BUILD.gn)

Bug: 764286
Change-Id: Ia229d1bcbbcbeb828103ff283197120da2a21b85
Reviewed-on: https://chromium-review.googlesource.com/671264
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Eric Noyau <noyau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#502603}