Updater: Copy 7z and tagging tool into signing dir

These will be uploaded together to the signing infra.

Bug: 926234
Change-Id: Ie6939d996687727db3c67be444fa8d7062b80433
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2443792
Auto-Submit: Joshua Pawlicki <waffles@chromium.org>
Commit-Queue: Sorin Jianu <sorin@chromium.org>
Reviewed-by: Sorin Jianu <sorin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813262}

chrome/updater/win/signing/BUILD.gn

@@ -4,9 +4,13 @@
 
 copy("signing") {
   sources = [
+    "$root_out_dir/certificate_tag.exe",
     "//chrome/tools/build/win/resedit.py",
+    "//third_party/lzma_sdk/7zr.exe",
     "sign.py",
   ]
 
-  outputs = [ "$root_out_dir/Updater Signing/{{source_file_part}}" ]
+  deps = [ "//chrome/updater/tools:certificate_tag" ]
+
+  outputs = [ "$root_out_dir/UpdaterSigning/{{source_file_part}}" ]
 }