Enable slimming paint by default (for trybots only)

Tools/Scripts/webkitpy/layout_tests/run_webkit_tests.py

Index: Tools/Scripts/webkitpy/layout_tests/run_webkit_tests.py
diff --git a/Tools/Scripts/webkitpy/layout_tests/run_webkit_tests.py b/Tools/Scripts/webkitpy/layout_tests/run_webkit_tests.py
index 16ab6bb624147fe909243c6246e8d130925b049a..586c370515e96be0c71e14dcb6a1ed0a3c94f756 100644
--- a/Tools/Scripts/webkitpy/layout_tests/run_webkit_tests.py
+++ b/Tools/Scripts/webkitpy/layout_tests/run_webkit_tests.py
@@ -47,6 +47,11 @@ _log = logging.getLogger(__name__)
 
 
 def main(argv, stdout, stderr):
+    argv += [
+        '--exit-after-n-crashes-or-timeouts=1000',
+        '--additional-driver-flag=--enable-slimming-paint',
+    ]
+
     options, args = parse_args(argv)
 
     if options.platform and 'test' in options.platform and not 'browser_test' in options.platform:
@@ -60,6 +65,12 @@ def main(argv, stdout, stderr):
 
     try:
         port = host.port_factory.get(options.platform, options)
+        # Search for virtual/slimmingpaint test expectations at first.
+        for baseline_path in port.default_baseline_search_path() + [port.layout_tests_dir()]:
+            options.additional_platform_directory.append(host.filesystem.join(baseline_path, 'virtual', 'slimmingpaint'))
+        _log.info('Baseline search path: ' + str(port.baseline_search_path()))
+
+        options.additional_expectations.append(host.filesystem.join(port.layout_tests_dir(), 'SlimmingPaintExpectations'))
     except NotImplementedError, e:
         # FIXME: is this the best way to handle unsupported port names?
         print >> stderr, str(e)