GN: Fix input not defined by deps issue with //build/android:sun_tools_java

build/android/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/android/rules.gni")
 
 sun_tools_jar_path = "$root_gen_dir/sun_tools_jar/tools.jar"
 
 action("find_sun_tools_jar") {
   script = "//build/android/gyp/find_sun_tools_jar.py"
   depfile = "$target_gen_dir/$target_name.d"
   outputs = [
     depfile,
     sun_tools_jar_path,
   ]
   args = [
     "--depfile",
     rebase_path(depfile, root_build_dir),
     "--output",
     rebase_path(sun_tools_jar_path, root_build_dir),
   ]
 }
 
 java_prebuilt("sun_tools_java") {
   jar_path = sun_tools_jar_path
+  deps = [
+    ":find_sun_tools_jar",
+  ]
 }