Add support for iOS application bundle to GN.

testing/test.gni

Index: testing/test.gni
diff --git a/testing/test.gni b/testing/test.gni
index 6739bfebb21ce85f18903e934fe9822658d2f109..8898fb16902bf4af9d69911a79af43ae9b1d3a42 100644
--- a/testing/test.gni
+++ b/testing/test.gni
@@ -123,51 +123,41 @@ template("test") {
       ]
     }
   } else if (is_ios) {
-    if (is_ios) {
-      import("//build/config/ios/rules.gni")
-    }
+    import("//build/config/ios/ios_sdk.gni")
+    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 = ""
+    ios_test_app(target_name) {
+      forward_variables_from(invoker, "*", [ "bundle_test_name" ])
       testonly = true
 
-      # See above call.
-      set_sources_assignment_filter([])
+      if (defined(invoker.bundle_test_name)) {
+        _bundle_test_name = invoker.bundle_test_name
+      } else if (defined(app_name)) {
+        _bundle_test_name = app_name
+      } else {
+        _bundle_test_name = target_name
+      }
 
-      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",
-                             ])
+      if (!defined(extra_substitutions)) {
+        extra_substitutions = []
+      }
+      extra_substitutions += [ "BUNDLE_ID_TEST_NAME=$_bundle_test_name" ]
 
-      if (defined(invoker.deps)) {
-        deps = invoker.deps
-      } else {
+      if (!defined(bundle_data)) {
+        bundle_data = []
+      }
+      bundle_data += [ "//testing/gtest_ios/Default.png" ]
+      info_plist = "//testing/gtest_ios/unittest-Info.plist"
+
+      if (!defined(entitlements_path)) {
+        entitlements_path = ""
+      }
+
+      if (!defined(code_signing_identity)) {
+        code_signing_identity = ios_code_signing_identity
+      }
+
+      if (!defined(deps)) {
         deps = []
       }
       deps += [