Deploy headless_shell binaries as headless-shell.zip.

Similarly to content_shell, deploys headless_shell as a zip archive.

Bug: 851125
Change-Id: Ie5403eb8912dcd1556c87b5da33b5552fa8c7d50
Reviewed-on: https://chromium-review.googlesource.com/1099759Reviewed-by: John Budorick <jbudorick@chromium.org>
Reviewed-by: Michael Moss <mmoss@chromium.org>
Commit-Queue: Pavel Feldman <pfeldman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567414}

chrome/tools/build/linux/FILES.cfg

@@ -292,4 +292,23 @@ FILES = [
     'archive': 'chromedriver_linux64.zip',
     'optional': ['official'],
   },
+  # Headless shell files:
+  {
+    'filename': 'headless_shell',
+    'buildtype': ['dev'],
+    'archive': 'headless-shell.zip',
+    'optional': ['dev'],
+  },
+  {
+    'filename': 'headless_lib.pak',
+    'buildtype': ['dev'],
+    'archive': 'headless-shell.zip',
+    'optional': ['dev'],
+  },
+  {
+    'filename': 'libosmesa.so',
+    'buildtype': ['dev'],
+    'archive': 'headless-shell.zip',
+    'optional': ['dev'],
+  },
 ]