Make Nexus5X bisect bot use 64 bit binaries.

scripts/slave/recipes/bisection/android_bisect.py

 # Copyright (c) 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.
 
 from recipe_engine.types import freeze
 
 DEPS = [
     'auto_bisect',
     'bisect_tester',
     'depot_tools/bot_update',
@@ skipping 17 matching lines @@
                 'recipe_config': 'main_builder_rel_mb',
                 'gclient_apply_config': ['android', 'perf'],
                 'bucket': 'chrome-perf',
             },
             'android_nexus5_perf_bisect': {
                 'recipe_config': 'main_builder_rel_mb',
                 'gclient_apply_config': ['android', 'perf'],
                 'bucket': 'chrome-perf',
             },
             'android_nexus5X_perf_bisect': {
-                'recipe_config': 'main_builder_rel_mb',
+                'recipe_config': 'arm64_builder_rel_mb',
                 'gclient_apply_config': ['android', 'perf'],
                 'bucket': 'chrome-perf',
             },
             'android_nexus6_perf_bisect': {
                 'recipe_config': 'main_builder_rel_mb',
                 'gclient_apply_config': ['android', 'perf'],
                 'bucket': 'chrome-perf',
             },
             'android_nexus7_perf_bisect': {
                 'recipe_config': 'main_builder_rel_mb',
@@ skipping 642 matching lines @@
     # multiple_device_status
     api.step_data('Debug Info', retcode=1) +
     api.override_step_data('device_status (3)',
         api.json.output(working_device)) +
     api.step_data('Expanding revision range.for revisions %s:%s (2)' % (
             good_revision_hash, bad_revision_hash),
         stdout=api.json.output([[bad_revision_hash, 'ignored'], [
             good_revision_hash, 'ignored']])) +
     api.step_data('Post bisect results',
         stdout=api.json.output({'status_code': 200})))