Add IntDefs to generated Java enums.

device/gamepad/BUILD.gn

 # Copyright 2016 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/features.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")  # For generate_jni().
 }
@@ skipping 86 matching lines @@
   }
 
   android_library("java") {
     java_files = [
       "android/java/src/org/chromium/device/gamepad/GamepadDevice.java",
       "android/java/src/org/chromium/device/gamepad/GamepadList.java",
       "android/java/src/org/chromium/device/gamepad/GamepadMappings.java",
     ]
     deps = [
       "//base:base_java",
+      "//third_party/android_tools:android_support_annotations_java",
     ]
     srcjar_deps = [ ":java_enums_srcjar" ]
   }
 
   java_cpp_enum("java_enums_srcjar") {
     sources = [
       "gamepad_standard_mappings.h",
     ]
   }
 }