Fix inputs for main_dex_list action.

build/config/android/internal_rules.gni

 # 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.
 
 # Do not add any imports to non-//build directories here.
 # Some projects (e.g. V8) do not have non-build directories DEPS'ed in.
 import("//build_overrides/build.gni")
 import("//build/config/android/config.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
@@ skipping 907 matching lines @@
                                  "inputs",
                                  "sources",
                                  "testonly",
                                ])
 
         script = "//build/android/gyp/main_dex_list.py"
         depfile = "$target_gen_dir/$target_name.d"
 
         main_dex_rules = "//build/android/main_dex_classes.flags"
 
+        if (!defined(inputs)) {
+          inputs = []
+        }
+        inputs += [ main_dex_rules ]
+
         outputs = [
           _main_dex_list_path,
         ]
 
         args = [
           "--depfile",
           rebase_path(depfile, root_build_dir),
           "--android-sdk-tools",
           rebased_android_sdk_build_tools,
           "--main-dex-list-path",
@@ skipping 1765 matching lines @@
         rebase_path(root_build_dir, root_build_dir),
         "--packed-libraries-dir",
         rebase_path(_packed_libraries_dir, root_build_dir),
         "--libraries=${invoker.libraries_filearg}",
         "--filelistjson",
         rebase_path(invoker.file_list_json, root_build_dir),
       ]
     }
   }
 }