Update isolate.gypi to support Swarming + move .isolate files

webrtc/modules/audio_coding/neteq/audio_decoder_unittests.isolate

-# Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
-#
-# Use of this source code is governed by a BSD-style license
-# that can be found in the LICENSE file in the root of the source
-# tree. An additional intellectual property rights grant can be found
-# in the file PATENTS.  All contributing project authors may
-# be found in the AUTHORS file in the root of the source tree.
-{
-  'conditions': [
-    ['OS=="linux" or OS=="mac" or OS=="win" or OS=="android"', {
-      'variables': {
-        'files': [
-          '<(DEPTH)/resources/audio_coding/testfile32kHz.pcm',
-        ],
-      },
-    }],
-    ['OS=="linux" or OS=="mac" or OS=="win"', {
-      'variables': {
-        'command': [
-          '<(DEPTH)/testing/test_env.py',
-          '<(PRODUCT_DIR)/audio_decoder_unittests<(EXECUTABLE_SUFFIX)',
-        ],
-        'files': [
-          '<(DEPTH)/DEPS',
-          '<(DEPTH)/testing/test_env.py',
-          '<(PRODUCT_DIR)/audio_decoder_unittests<(EXECUTABLE_SUFFIX)',
-        ],
-      },
-    }],
-  ],
-}