Add GN target for the sample shell

BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/android/config.gni")
 import("//build/config/arm.gni")
 import("//build/config/mips.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
 if (is_android) {
@@ skipping 47 matching lines @@
 
   # Similar to vfp but on MIPS.
   v8_can_use_fpu_instructions = true
 
   # Similar to the ARM hard float ABI but on MIPS.
   v8_use_mips_abi_hardfloat = true
 }
 
 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
   # allows the tool to see the memory accesses from JITted code. Without this
   # flag, JS code causes false positive reports from MSan.
   v8_target_arch = "arm64"
 } else {
   v8_target_arch = target_cpu
 }
 
@@ skipping 2042 matching lines @@
 
     if (!is_component_build) {
       sources += [ "$target_gen_dir/d8-js.cc" ]
     }
     if (v8_enable_i18n_support) {
       deps += [ "//third_party/icu" ]
     }
   }
 }
 
+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",
   ]
 
   deps = [
     ":fuzzer_support",
   ]
 
   configs -= [ "//build/config/compiler:chromium_code" ]
@@ skipping 74 matching lines @@
 
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ "//build/config/compiler:no_chromium_code" ]
   configs += [
     ":internal_config",
     ":libplatform_config",
     ":features",
     ":toolchain",
   ]
 }