[Telemetry] Explicitly disable ModalPermissionPrompts on Android

telemetry/telemetry/internal/backends/chrome/chrome_browser_backend.py

 # Copyright 2013 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 logging
 import os
 import pprint
 import re
 import shlex
 import sys
@@ skipping 66 matching lines @@
 
     # TODO(crbug.com/760319): This is a hack to temporarily disable modal
     # permission prompts on Android. Remove after implementing a longer term
     # solution.
     if self.browser_options.block_modal_permission_prompts:
       for i, arg in enumerate(args):
         if arg.startswith('--enable-features='):
           args[i] = re.sub(r',\w+<PermissionPromptUIAndroidModal\b', '', arg)
         elif arg.startswith('--force-fieldtrials='):
           args[i] = re.sub(r'\bPermissionPromptUIAndroidModal/\w+/', '', arg)
+        elif arg.startswith('--disable-features='):
+          args[i] = ','.join([
+              args[i], 'ModalPermissionPrompts<PermissionPromptUIAndroidModal'])
 
     args.append('--enable-net-benchmarking')
     args.append('--metrics-recording-only')
     args.append('--no-default-browser-check')
     args.append('--no-first-run')
 
     # Turn on GPU benchmarking extension for all runs. The only side effect of
     # the extension being on is that render stats are tracked. This is believed
     # to be effectively free. And, by doing so here, it avoids us having to
     # programmatically inspect a pageset's actions in order to determine if it
@@ skipping 239 matching lines @@
   def supports_cpu_metrics(self):
     return True
 
   @property
   def supports_memory_metrics(self):
     return True
 
   @property
   def supports_power_metrics(self):
     return True