Create a internal, global native context used only for generated code stubs

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 45bc4fd088e1c2b2bd3621e7730f1c17bf6decee..08cda0b1dc9dc96d6d39c1f67e0a5782ba410eb3 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -257,6 +257,40 @@ action("js2c") {
   }
 }
 
+action("js2c_code_stubs") {
+  visibility = [ ":*" ]  # Only targets in this file can depend on this.
+
+  script = "tools/js2c.py"
+
+  # The script depends on this other script, this rule causes a rebuild if it
+  # changes.
+  inputs = [ "tools/jsmin.py" ]
+
+  sources = [
+    "src/macros.py",
+    "src/messages.h",
+    "src/code-stubs.js"
+  ]
+
+  outputs = [
+    "$target_gen_dir/code-stub-libraries.cc",
+  ]
+
+  args = [
+           rebase_path("$target_gen_dir/code-stub-libraries.cc",
+                       root_build_dir),
+           "CODE_STUB",
+         ] + rebase_path(sources, root_build_dir)
+
+  if (v8_use_external_startup_data) {
+    outputs += [ "$target_gen_dir/libraries_code_stub.bin" ]
+    args += [
+      "--startup_blob",
+      rebase_path("$target_gen_dir/libraries_code_stub.bin", root_build_dir),
+    ]
+  }
+}
+
 action("js2c_experimental") {
   visibility = [ ":*" ]  # Only targets in this file can depend on this.
 
@@ -354,12 +388,14 @@ if (v8_use_external_startup_data) {
 
     deps = [
       ":js2c",
+      ":js2c_code_stubs",
       ":js2c_experimental",
       ":js2c_extras",
     ]
 
     sources = [
       "$target_gen_dir/libraries.bin",
+      "$target_gen_dir/libraries_code_stub.bin",
       "$target_gen_dir/libraries_experimental.bin",
       "$target_gen_dir/libraries_extras.bin",
     ]
@@ -445,6 +481,7 @@ source_set("v8_nosnapshot") {
 
   deps = [
     ":js2c",
+    ":js2c_code_stubs",
     ":js2c_experimental",
     ":js2c_extras",
     ":v8_base",
@@ -452,6 +489,7 @@ source_set("v8_nosnapshot") {
 
   sources = [
     "$target_gen_dir/libraries.cc",
+    "$target_gen_dir/code-stub-libraries.cc",
     "$target_gen_dir/experimental-libraries.cc",
     "$target_gen_dir/extras-libraries.cc",
     "src/snapshot/snapshot-empty.cc",
@@ -476,6 +514,7 @@ source_set("v8_snapshot") {
 
   deps = [
     ":js2c",
+    ":js2c_code_stubs",
     ":js2c_experimental",
     ":js2c_extras",
     ":v8_base",
@@ -488,6 +527,7 @@ source_set("v8_snapshot") {
 
   sources = [
     "$target_gen_dir/libraries.cc",
+    "$target_gen_dir/code-stub-libraries.cc",
     "$target_gen_dir/experimental-libraries.cc",
     "$target_gen_dir/extras-libraries.cc",
     "$target_gen_dir/snapshot.cc",
@@ -508,6 +548,7 @@ if (v8_use_external_startup_data) {
 
     deps = [
       ":js2c",
+      ":js2c_code_stubs",
       ":js2c_experimental",
       ":js2c_extras",
       ":v8_base",