Specify path to aidl tool in gyp file

build/java_aidl.gypi

 # Copyright (c) 2012 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.
 
 # This file is meant to be included into a target to provide a rule
 # to build Java aidl files in a consistent manner.
 #
 # To use this, create a gyp target with the following form:
 # {
 #   'target_name': 'aidl_aidl-file-name',
@@ skipping 19 matching lines @@
       'rule_name': 'compile_aidl',
       'extension': 'aidl',
       'inputs': [
         '<(android_sdk)/framework.aidl',
         '<(aidl_interface_file)',
       ],
       'outputs': [
         '<(PRODUCT_DIR)/lib.java/<(RULE_INPUT_ROOT).java',
       ],
       'action': [
-        'aidl',
+        '<(android_sdk_tools)/aidl',
         '-p<(android_sdk)/framework.aidl',
         '-p<(aidl_interface_file)',
         '-o<(PRODUCT_DIR)/lib.java/',
         '<(RULE_INPUT_PATH)',
       ],
     },
   ],
 }