Add content animation tests to benchmark_runner, and allow the runner to collect...

Add content animation tests to benchmark_runner, and allow the runner to collect device data as part of the results
https://bugs.webkit.org/show_bug.cgi?id=156827
PerformanceTests:

Reviewed by Stephanie Lewis.

Two new files for the content-animation suite.

After patching for use in the benchmark, these tests are a little different to other benchmarks.
The test content itself does not collect performance data; the tests spit out a boilerplate JSON
result with a placeholder for framerate, which is collected in native code.

When run as a benchmark, test completion involves a couple of bounces between the test and MobileSafari.
Test completion is initiated by a setTimeout() in the test, at which point location.hash is set to "#done".
MobileSafari detects that, and asynchronously dumps performance data. Once this is complete, MobileSafari
changes the URL has to "#submit", which triggers the XHR to the test relay that indicates the test is
complete.

* Animation/css-animation.html: Added.
* Animation/raf-animation.html: Added.

Tools:

rdar://problem/24358135

Reviewed by Stephanie Lewis.

Enhance benchmark_runner so that a benchmark can load a set of tests sequentially,
and collate results across them. Also add the ability for the browser_driver to supply
additional results, allowing for tests that collect results data in native code, rather
than generating it in the web page.

Add a set of "content animation" tests that use this new functionality, which test
CSS animation and requestAnimationFrame performance.

'plan' files have two new optional keys:
    'test_files': a list of files to run as a suite
    'options': optional parameters. Currently supports one new option,
        'animation_command', which affects the way that iOS tests are run,
        and is passed to MobileSafari as a parameter on launch.

* Scripts/webkitpy/benchmark_runner/benchmark_runner.py:
(BenchmarkRunner.__init__): If options is not specified in the plan file, set it to an empty dictionary.
(BenchmarkRunner._get_result): Allow the browser_driver to modify the test results.
(BenchmarkRunner):
(BenchmarkRunner._run_one_test): Factored out of _run_benchmark, this contains logic for
running a single test. It starts and stops the http_server_driver.
(BenchmarkRunner._run_benchmark): Run a test in the traditional way if the plan has an 'entry_point'
key, otherwise look for the new 'test_files' and load each in a loop.
(BenchmarkRunner._dump):
* Scripts/webkitpy/benchmark_runner/browser_driver/browser_driver.py:
(BrowserDriver.launch_url): Pass options.
(BrowserDriver.add_additional_results): Allow a driver to supply additional results.
(BrowserDriver):
* Scripts/webkitpy/benchmark_runner/browser_driver/gtk_minibrowser_driver.py:
(GTKMiniBrowserDriver.launch_url):
* Scripts/webkitpy/benchmark_runner/browser_driver/osx_browser_driver.py:
(OSXBrowserDriver.close_browsers):
(OSXBrowserDriver._terminate_processes): Fix spelling mistake.
(OSXBrowserDriver._terminiate_processes): Deleted.
* Scripts/webkitpy/benchmark_runner/browser_driver/osx_chrome_driver.py:
(OSXChromeDriver.launch_url):
(OSXChromeCanaryDriver.launch_url):
* Scripts/webkitpy/benchmark_runner/browser_driver/osx_firefox_driver.py:
(OSXFirefoxDriver.launch_url):
(OSXFirefoxNightlyDriver.launch_url):
* Scripts/webkitpy/benchmark_runner/browser_driver/osx_safari_driver.py:
(OSXSafariDriver.launch_url):
* Scripts/webkitpy/benchmark_runner/data/patches/ContentAnimation.patch: Added.
* Scripts/webkitpy/benchmark_runner/data/plans/content-animation.plan: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@199805 268f45cc-cd09-0410-ab3c-d52691b4dbfc