Add GN target for the sample shell

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 0176108ad81138cf56fae6d0c7499238c94a0b0a..f3d670daf961bc7bb3c21d10fbe194d3e91fb2c0 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -65,6 +65,7 @@ declare_args() {
 
 v8_random_seed = "314159265"
 v8_toolset_for_d8 = "host"
+v8_toolset_for_shell = "host"
 
 if (is_msan) {
   # Running the V8-generated code on an ARM simulator is a powerful hack that
@@ -2127,6 +2128,38 @@ if ((current_toolchain == host_toolchain && v8_toolset_for_d8 == "host") ||
   }
 }
 
+if ((current_toolchain == host_toolchain && v8_toolset_for_shell == "host") ||
+    (current_toolchain == snapshot_toolchain && v8_toolset_for_shell == "host") ||
+    (current_toolchain != host_toolchain && v8_toolset_for_shell == "target")) {
+  executable("shell") {
+    sources = [
+      "samples/shell.cc",
+    ]
+
+    configs -= [ "//build/config/compiler:chromium_code" ]
+    configs += [ "//build/config/compiler:no_chromium_code" ]
+    configs += [
+      # Note: don't use :internal_config here because this target will get
+      # the :external_config applied to it by virtue of depending on :v8, and
+      # you can't have both applied to the same target.
+      ":internal_config_base",
+      ":features",
+      ":toolchain",
+    ]
+
+    deps = [
+      ":v8",
+      ":v8_libplatform",
+      "//build/config/sanitizers:deps",
+      "//build/win:default_exe_manifest",
+    ]
+
+    if (v8_enable_i18n_support) {
+      deps += [ "//third_party/icu" ]
+    }
+  }
+}
+
 source_set("json_fuzzer") {
   sources = [
     "test/fuzzer/json.cc",