Discourage creation of Java infobars without InfoBarDelegates

components/infobars/core/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/ui.gni")
 
+if (is_android) {
+  import("//build/config/android/config.gni")
+  import("//build/config/android/rules.gni")
+}
+
 static_library("core") {
   sources = [
     "confirm_infobar_delegate.cc",
     "confirm_infobar_delegate.h",
     "infobar.cc",
     "infobar.h",
     "infobar_container.cc",
     "infobar_container.h",
     "infobar_delegate.cc",
     "infobar_delegate.h",
@@ skipping 13 matching lines @@
     "//ui/base",
     "//ui/gfx",
     "//ui/strings",
     "//url",
   ]
 
   if (use_aura || (!is_ios && !is_android)) {
     deps += [ "//ui/native_theme" ]
   }
 }
+
+if (is_android) {
+  # GYP: //components/infobars.gypi:infobar_delegate_java
+  java_cpp_enum("infobar_enums_java") {
+    sources = [
+      "infobar_delegate.h",
+    ]
+  }
+}