Add WebDriver support in browser driver part of BenchmarkRunner

Add WebDriver support in browser driver part of BenchmarkRunner
https://bugs.webkit.org/show_bug.cgi?id=174445

Patch by Matthew Stewart <matthew_r_stewart@apple.com> on 2017-07-24
Reviewed by Stephanie Lewis.

Adds a launch_driver function to each BrowserDriver subclass. This
function sets up the arguments for the webdriver and launches the
webdriver specific to that browser.

* Scripts/webkitpy/benchmark_runner/browser_driver/browser_driver.py:
(BrowserDriver.launch_webdriver):
(BrowserDriver):
* Scripts/webkitpy/benchmark_runner/browser_driver/linux_browser_driver.py:
(LinuxBrowserDriver.launch_webdriver):
* Scripts/webkitpy/benchmark_runner/browser_driver/linux_chrome_driver.py:
(LinuxChromeDriver.launch_url):
(LinuxChromeDriver):
(LinuxChromeDriver.launch_driver):
* Scripts/webkitpy/benchmark_runner/browser_driver/linux_epiphany_driver.py:
(EpiphanyBrowserDriver.launch_url):
(EpiphanyBrowserDriver):
(EpiphanyBrowserDriver.launch_driver):
* Scripts/webkitpy/benchmark_runner/browser_driver/linux_firefox_driver.py:
(LinuxFirefoxDriver):
(LinuxFirefoxDriver.launch_url):
(LinuxFirefoxDriver.launch_driver):
* Scripts/webkitpy/benchmark_runner/browser_driver/linux_minibrowsergtk_driver.py:
(GTKMiniBrowserDriver.launch_url):
(GTKMiniBrowserDriver):
(GTKMiniBrowserDriver.launch_driver):
* Scripts/webkitpy/benchmark_runner/browser_driver/osx_browser_driver.py:
(OSXBrowserDriver._launch_webdriver):
(OSXBrowserDriver):
(OSXBrowserDriver._screen_size):
(OSXBrowserDriver._insert_url):
* Scripts/webkitpy/benchmark_runner/browser_driver/osx_chrome_driver.py:
(OSXChromeDriver):
(OSXChromeDriver.launch_url):
(OSXChromeDriver.launch_driver):
(OSXChromeCanaryDriver):
(OSXChromeCanaryDriver.launch_url):
(OSXChromeCanaryDriver.launch_driver):
* Scripts/webkitpy/benchmark_runner/browser_driver/osx_firefox_driver.py:
(OSXFirefoxDriver):
(OSXFirefoxDriver.launch_url):
(OSXFirefoxDriver.launch_driver):
(OSXFirefoxNightlyDriver):
(OSXFirefoxNightlyDriver.launch_url):
(OSXFirefoxNightlyDriver.launch_driver):
* Scripts/webkitpy/benchmark_runner/browser_driver/osx_safari_driver.py:
(OSXSafariDriver.launch_driver):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@219850 268f45cc-cd09-0410-ab3c-d52691b4dbfc