headless: Add a headless shell

headless/app/headless_shell_main.cc

Index: headless/app/headless_shell_main.cc
diff --git a/blimp/engine/app/blimp_main.cc b/headless/app/headless_shell_main.cc
similarity index 77%
copy from blimp/engine/app/blimp_main.cc
copy to headless/app/headless_shell_main.cc
index 64e3e5343802704fd9998442b485145ec2b708b2..ffe8af84c245a1972ca20457e3efc583c3a48b40 100644
--- a/blimp/engine/app/blimp_main.cc
+++ b/headless/app/headless_shell_main.cc
@@ -2,11 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "blimp/engine/app/blimp_content_main_delegate.h"
 #include "content/public/app/content_main.h"
+#include "headless/lib/headless_main_delegate.h"
 
 int main(int argc, const char** argv) {
-  blimp::engine::BlimpContentMainDelegate delegate;
+  headless::HeadlessMainDelegate delegate;
   content::ContentMainParams params(&delegate);
   params.argc = argc;
   params.argv = argv;