Emit logcats from unit_tests.

chrome/unit_tests_apk.isolate

 # Copyright 2015 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.
 {
   'includes': [
     '../build/android/android.isolate',
     '../net/tools/testserver/testserver.isolate',
     'unit_tests.isolate',
   ],
   'variables': {
     'command': [
       '<(PRODUCT_DIR)/bin/run_unit_tests',
+      '--logcat-output-dir', '${ISOLATED_OUTDIR}/logcats',
     ],
     'files': [
       '../base/base.isolate',
       '../build/config/',
       '../gin/v8.isolate',
       '../third_party/angle/angle.isolate',
       '../third_party/icu/icu.isolate',
       '../third_party/instrumented_libraries/instrumented_libraries.isolate',
       '../ui/gl/gl.isolate',
       '<(PRODUCT_DIR)/bin/run_unit_tests',
       '<(PRODUCT_DIR)/unit_tests_apk/',
       'unit_tests.isolate',
     ]
   },
 }