Add HeadlessTabSocket

headless/BUILD.gn

Index: headless/BUILD.gn
diff --git a/headless/BUILD.gn b/headless/BUILD.gn
index 6345e098a44e826849f1c47b48357d3ed5478f6c..ea8089c24e960d3a7b5930e0ce0643fc697a257b 100644
--- a/headless/BUILD.gn
+++ b/headless/BUILD.gn
@@ -100,12 +100,25 @@ action("embed_resources") {
   ]
 }
 
+mojom("tab_socket") {
+  sources = [
+    "lib/tab_socket.mojom",
+  ]
+}
+
 grit("resources") {
   source = "lib/resources/headless_lib_resources.grd"
   outputs = [
     "grit/headless_lib_resources.h",
     "$root_gen_dir/headless/headless_lib_resources.pak",
   ]
+  grit_flags = [
+    "-E",
+    "mojom_root=" + rebase_path(root_gen_dir),
+  ]
+  deps = [
+    ":tab_socket__generator",
+  ]
 }
 
 devtools_domains = [
@@ -220,6 +233,8 @@ static_library("headless_lib") {
               "lib/browser/headless_platform_event_source.h",
               "lib/browser/headless_shell_application_mac.mm",
               "lib/browser/headless_shell_application_mac.h",
+              "lib/browser/headless_tab_socket_impl.cc",
+              "lib/browser/headless_tab_socket_impl.h",
               "lib/browser/headless_url_request_context_getter.cc",
               "lib/browser/headless_url_request_context_getter.h",
               "lib/browser/headless_web_contents_impl.cc",
@@ -303,6 +318,7 @@ static_library("headless_lib") {
 
   deps = [
     ":gen_devtools_client_api",
+    ":tab_socket",
     ":version_header",
     "//base",
     "//components/crash/content/browser",