Create a Dockerfile.base and ensure it is included in build tarballs.

blimp/engine/BUILD.gn

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/features.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/ui.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//tools/grit/repack.gni")
@@ skipping 514 matching lines @@
     # we can be sure that everything is built before the action is
     # complete (though not necessarily before we generate the manifest
     # itself).
     deps = [
       ":engine",
     ]
   }
 
   # Builds and bundles the engine into a tarball that can be used to build a
   # Docker image.
   action("blimp_engine_bundle") {

[Sriram, 2016/06/16 18:04:08]

Should blimp_engine_env_tests_bundle target be updated to include the base file
as well?

[Sriram, 2016/06/16 18:05:15]

grr - coffee time! Ignore this.

     script = "//blimp/tools/create-bundle.py"
 
     # These form the arguments to the script.
     _rebased_out_dir = rebase_path(root_out_dir)
     _rebased_dockerfile = rebase_path("//blimp/engine/Dockerfile")
+    _rebased_dockerfile_base = rebase_path("//blimp/tools/Dockerfile.base")
     _rebased_startup_script = rebase_path("//blimp/engine/start_engine.sh")
     _bundle = "$root_out_dir/blimp_engine_bundle.tar.gz"
 
     # Depending on this ensures that both the manifest is generated
     # and everything in the manifest has been built.
     deps = [
       ":generate_manifest",
     ]
 
     sources = [
       _manifest,
       _rebased_dockerfile,
+      _rebased_dockerfile_base,
       _rebased_startup_script,
     ]
     outputs = [
       _bundle,
     ]
 
     # Manually specify the actual arguments to the script.
     args = [
       "--build-dir",
       _rebased_out_dir,
       "--filelist",
       _rebased_dockerfile,
+      _rebased_dockerfile_base,
       _rebased_startup_script,
       "--manifest",
       _rebased_manifest,
       "--output",
       rebase_path(_bundle),
     ]
   }
 
   # Crash symbols should only be created and uploaded from official builders.
   if (is_official_build) {
@@ skipping 66 matching lines @@
     "//content/test:test_support",
     "//testing/gmock",
     "//testing/gtest",
   ]
 
   data = [
     "data/",
     "$root_out_dir/blimp_engine.pak",
   ]
 }