Fixes <http://webkit.org/b/72526> REGRESSION (NRWT): WebKitTestRunner crash log gets saved
when web process crashes, but WebProcess crash log should get saved instead

Reviewed by Eric Seidel.

* Scripts/webkitpy/layout_tests/controllers/test_result_writer.py:
(write_test_result): Simplified a little to share more code between the case where we
crashed when running the test and where we crashed when checking the expected rendering for
a reftest. Changed to pass the crashed process name down to write_crash_report.
(TestResultWriter.write_crash_report): Added crashed_process_name parameter, which we pass
along to CrashLogs.find_newest_log rather than always using the driver name.

* Scripts/webkitpy/layout_tests/port/chromium.py:
(ChromiumDriver.run_test): Pass the driver name as the name of the crashed process if we
crashed.

* Scripts/webkitpy/layout_tests/port/test.py:
(TestInstance.__init__): Initialize new web_process_crash attribute.
(unit_test_list): Added new web-process-crash-with-stderr test, which is used by the new
test this patch adds.
(TestDriver.run_test): Pass a crashed process name to DriverOutput based on whether the test
specifies that the driver crashed or the web process crashed.

* Scripts/webkitpy/layout_tests/run_webkit_tests_integrationtest.py:
(MainTest.test_web_process_crash_log): Added. Similar to test_crash_log, but uses a test for
which we pretend the web process crashed rather than the driver process.

(MainTest.test_run_singly_actually_runs_tests):
(MainTest.test_unexpected_failures):
(EndToEndTest.test_end_to_end):
Updated magic numbers to account for new unexpected failing test added to unit_test_list.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@100648 268f45cc-cd09-0410-ab3c-d52691b4dbfc