List jmake as an input where it's used.

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.
 
 import("//build/config/android/config.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/zip.gni")
 import("//third_party/ijar/ijar.gni")
 
 assert(is_android)
@@ skipping 1438 matching lines @@
       "--use-ijars",
       "--classpath=@FileArg($_rebased_build_config:javac:classpath)",
       "--jar-path=$_rebased_jar_path",
       "--java-srcjars=$_rebased_java_srcjars",
       "--java-srcjars=@FileArg($_rebased_build_config:javac:srcjars)",
       "--jar-excluded-classes=$_jar_excluded_patterns",
     ]
     if (_enable_incremental_javac) {
       args += [ "--incremental" ]
       deps += [ "//third_party/jmake" ]
+      inputs += [ "$root_out_dir/bin/jmake" ]
       outputs += [ "${_javac_jar_path}.pdb" ]
     }
     if (_supports_android) {
       if (defined(invoker.alternative_android_sdk_ijar)) {
         deps += [ invoker.alternative_android_sdk_ijar_dep ]
         _android_sdk_ijar = invoker.alternative_android_sdk_ijar
       } else {
         deps += [ "//build/android:android_ijar" ]
         _android_sdk_ijar = "$root_out_dir/lib.java/android.interface.jar"
       }
@@ skipping 690 matching lines @@
     ]
     args = [
       "--depfile",
       rebase_path(depfile, root_build_dir),
       "--script-output-path",
       rebase_path(generated_script, root_build_dir),
     ]
     args += test_runner_args
   }
 }