[headless] Embed pak file into binary.

headless/BUILD.gn

Index: headless/BUILD.gn
diff --git a/headless/BUILD.gn b/headless/BUILD.gn
index e1a853ee47ccb18a0d79241a9908309ffe26829e..49d1b471b6e375391f9310092cc72b6a4aab7795 100644
--- a/headless/BUILD.gn
+++ b/headless/BUILD.gn
@@ -46,6 +46,39 @@ repack("pak") {
   output = "$root_out_dir/headless_lib.pak"
 }
 
+action("embed_resources") {
+  # Consider zipping file here, it can reduce size up to 80%.
+  script = "//headless/lib/embed_data.py"
+
+  inputs = [
+    "$root_out_dir/headless_lib.pak",
+  ]
+
+  outputs = [
+    "$root_gen_dir/headless/embedded_resource_pak.cc",
+    "$root_gen_dir/headless/embedded_resource_pak.h",
+  ]
+
+  args = [
+    "--data_file",
+    rebase_path("$root_out_dir/headless_lib.pak"),
+    "--gendir",
+    rebase_path("$root_gen_dir"),
+    "--header_file",
+    "headless/embedded_resource_pak.h",
+    "--source_file",
+    "headless/embedded_resource_pak.cc",
+    "--namespace",
+    "headless",
+    "--variable_name",
+    "kHeadlessResourcePak",
+  ]
+
+  deps = [
+    ":pak",
+  ]
+}
+
 grit("headless_lib_resources_grit") {
   source = "lib/resources/headless_lib_resources.grd"
   outputs = [
@@ -143,6 +176,8 @@ action("gen_devtools_client_api") {
 
 static_library("headless_lib") {
   sources = [
+    "$root_gen_dir/headless/embedded_resource_pak.cc",
+    "$root_gen_dir/headless/embedded_resource_pak.h",
     "$target_gen_dir/public/domains/accessibility.cc",
     "$target_gen_dir/public/domains/accessibility.h",
     "$target_gen_dir/public/domains/animation.cc",
@@ -230,6 +265,7 @@ static_library("headless_lib") {
     "lib/headless_content_main_delegate.h",
     "lib/renderer/headless_content_renderer_client.cc",
     "lib/renderer/headless_content_renderer_client.h",
+    "lib/util/embedded_file.h",
     "lib/utility/headless_content_utility_client.cc",
     "lib/utility/headless_content_utility_client.h",
     "public/headless_browser.cc",
@@ -246,6 +282,7 @@ static_library("headless_lib") {
   ]
 
   deps = [
+    ":embed_resources",
     ":gen_devtools_client_api",
     ":pak",
     "//base",