[chromedriver] Fix Android test runner by creating a new driver when needed.

Also, change android_package to androidPackage, to match convention.
Review URL: https://codereview.chromium.org/13925005

git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/webdriver@193405 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
3 files changed