make sure cflags is forwarded in the ios_app executable template

build/config/ios/rules.gni

 # Copyright 2015 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.
 
 ios_app_script = "//build/config/ios/ios_app.py"
 
 template("code_sign_ios") {
   assert(defined(invoker.entitlements_path),
          "The path to the entitlements .xcent file")
   assert(defined(invoker.identity), "The code signing identity")
@@ skipping 75 matching lines @@
   plist_gen_target_name = target_name + "_plist"
   bin_gen_target_name = target_name + "_bin"
   group_target_name = target_name
 
   # Generate the executable
   executable(bin_gen_target_name) {
     visibility = [ ":$group_target_name" ]
 
     output_name = "${_app_name}.app/${_app_name}"
 
+    forward_variables_from(invoker,
+                           [
+                             "all_dependent_configs",
+                             "allow_circular_includes_from",
+                             "cflags",
+                             "cflags_c",
+                             "cflags_cc",
+                             "cflags_objc",
+                             "cflags_objcc",
+                             "configs",
+                             "check_includes",
+                             "data",
+                             "data_deps",
+                             "defines",
+                             "forward_dependent_configs_from",
+                             "include_dirs",
+                             "ldflags",
+                             "public",
+                             "public_configs",
+                             "public_deps",
+                             "sources",
+                           ])
+
     if (defined(invoker.libs)) {
       libs = invoker.libs
     } else {
       libs = []
     }
     libs += [
       "UIKit.framework",
       "QuartzCore.framework",
       "OpenGLES.framework",
     ]
@@ skipping 54 matching lines @@
   group(target_name) {
     deps = [
       ":$plist_gen_target_name",
       ":$bin_gen_target_name",
     ]
     if (invoker.code_signing_identity != "") {
       deps += [ ":$code_sign_gen_target_name" ]
     }
   }
 }