[gn] Add unittests

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 2003 matching lines @@
       "//build/config/sanitizers:deps",
       "//build/win:default_exe_manifest",
     ]
   }
 }
 
 ###############################################################################
 # Public targets
 #
 
+want_v8_shell = (
+    (current_toolchain == host_toolchain && v8_toolset_for_shell == "host") ||
+    (current_toolchain == v8_snapshot_toolchain &&
+     v8_toolset_for_shell == "host") ||
+    (current_toolchain != host_toolchain && v8_toolset_for_shell == "target"))
+
+group("gn_all") {
+  testonly = true
+
+  deps = [
+    ":d8",
+  ]
+
+  if (want_v8_shell) {
+    deps += [
+      ":v8_shell",
+    ]
+  }
+
+  if (host_os != "mac" || !is_android) {
+    # These items don't compile for Android on Mac.
+    deps += [
+      "test/unittests:unittests",
+    ]
+  }
+}
+
 if (is_component_build) {
   component("v8") {
     sources = [
       "src/v8dll-main.cc",
     ]
 
     public_deps = [
       ":v8_base",
       snapshot_target,
     ]
@@ skipping 52 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 == v8_snapshot_toolchain &&
-     v8_toolset_for_shell == "host") ||
-    (current_toolchain != host_toolchain && v8_toolset_for_shell == "target")) {
+if (want_v8_shell) {
   executable("v8_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
@@ skipping 68 matching lines @@
   sources = [
     "test/fuzzer/wasm-asmjs.cc",
   ]
 
   deps = [
     ":fuzzer_support",
   ]
 
   configs = [ ":internal_config" ]
 }