add a --chromedriver_version in _web

Author: KazuCocoa

test/functional/android/driver_test.rb

@@ -7,6 +7,9 @@ class DriverTest < AppiumLibCoreTest::Function::TestCase
     def setup
       @@core ||= ::Appium::Core.for(Caps.android)
       @driver = @@core.start_driver
+
+      require 'pry'
+      binding.pry
     end
 
     def teardown

test/test_helper.rb

@@ -138,6 +138,8 @@ def android_web
           # An emulator 8.1 has Chrome/61.0.3163.98
           # Download a chrome driver from https://chromedriver.storage.googleapis.com/index.html?path=2.34/
           # chromedriverExecutable: "#{Dir.pwd}/test/functional/app/chromedriver_2.34",
+          # Or `npm install --chromedriver_version="2.24"` and
+          # chromedriverUseSystemExecutable: true,
           udid: get_udid_name,
           deviceName: 'Android Emulator',
           someCapability: 'some_capability',