Android: Enable depfile for generate_jni_registration() template

build/config/android/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/config/android/config.gni")
 import("//build/config/android/internal_rules.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/dcheck_always_on.gni")
@@ skipping 358 matching lines @@
       script = "//base/android/jni_generator/jni_registration_generator.py"
       deps = [
         "${invoker.target}__build_config",
       ]
       inputs = [
         _build_config,
       ]
       outputs = [
         invoker.output,
       ]
+      depfile = "$target_gen_dir/$target_name.d"
 
       args = [
         # This is a list of .sources files.
         "--sources_files=@FileArg($_rebased_build_config:jni:all_source)",
         "--output",
         rebase_path(invoker.output, root_build_dir),
         "--no_register_java=$_rebase_exception_java_files",
+        "--depfile",
+        rebase_path(depfile, root_build_dir),
       ]
     }
   }
 
   # Declare a target for c-preprocessor-generated java files
   #
   # NOTE: For generating Java conterparts to enums prefer using the java_cpp_enum
   #       rule instead.
   #
   # This target generates java files using the host C pre-processor. Each file in
@@ skipping 2626 matching lines @@
         # because in practice they seem to contain classes required to be in the
         # classpath.
         deps += _subjar_targets
       }
       if (defined(_res_target_name)) {
         deps += [ ":$_res_target_name" ]
       }
     }
   }
 }