Add support for Mac/iOS application bundles to GN tool.

testing/test.gni

Index: testing/test.gni
diff --git a/testing/test.gni b/testing/test.gni
index 6739bfebb21ce85f18903e934fe9822658d2f109..3ba52cf7d007a92ef2c950d723da69b7ffe1b53a 100644
--- a/testing/test.gni
+++ b/testing/test.gni
@@ -123,53 +123,14 @@ template("test") {
       ]
     }
   } else if (is_ios) {
-    if (is_ios) {
-      import("//build/config/ios/rules.gni")
-    }
-
-    ios_app(target_name) {
-      # TODO(GYP): Make this configurable and only provide a default
-      # that can be overridden.
-      info_plist = "//testing/gtest_ios/unittest-Info.plist"
-      app_name = target_name
-      entitlements_path = "//testing/gtest_ios"
-      code_signing_identity = ""
-      testonly = true
-
-      # See above call.
-      set_sources_assignment_filter([])
-
-      forward_variables_from(invoker,
-                             [
-                               "all_dependent_configs",
-                               "allow_circular_includes_from",
-                               "cflags",
-                               "cflags_c",
-                               "cflags_cc",
-                               "cflags_objc",
-                               "cflags_objcc",
-                               "check_includes",
-                               "configs",
-                               "data",
-                               "data_deps",
-                               "defines",
-                               "include_dirs",
-                               "ldflags",
-                               "libs",
-                               "output_extension",
-                               "output_name",
-                               "public",
-                               "public_configs",
-                               "public_deps",
-                               "sources",
-                               "visibility",
-                             ])
+    import("//build/config/ios/rules.gni")
+    ios_test_app(target_name) {
+      forward_variables_from(invoker, "*")
 
-      if (defined(invoker.deps)) {
-        deps = invoker.deps
-      } else {
+      if (!defined(invoker.deps)) {
         deps = []
       }
+
       deps += [
         # All shared libraries must have the sanitizer deps to properly link in
         # asan mode (this target will be empty in other cases).