Nix upstreaming - Adding build files and supporting scripts

Nix upstreaming - Adding build files and supporting scripts
https://bugs.webkit.org/show_bug.cgi?id=118367

Reviewed by Ryosuke Niwa.

.:

* CMakeLists.txt:
* Source/CMakeLists.txt:
* Source/cmake/FindEGL.cmake:
* Source/cmake/FindOpenGLES2.cmake: Added.
* Source/cmake/OptionsCommon.cmake:
* Source/cmake/OptionsNix.cmake: Added.

Source/Platform:

* CMakeLists.txt: Added.
* PlatformNix.cmake: Added.

Source/WebCore:

No new tests needed.

* CMakeLists.txt:
* PlatformNix.cmake: Added.

Source/WTF:

* wtf/FeatureDefines.h:
* wtf/Platform.h:
* wtf/PlatformNix.cmake: Added.

Tools:

* Scripts/build-webkit:
* Scripts/run-nix-tests: Added.
* Scripts/run-webkit-tests:
* Scripts/update-webkit-libs-jhbuild:
* Scripts/update-webkitnix-libs: Added.
* Scripts/webkitdirs.pm:
(determineArchitecture):
(argumentsForConfiguration):
(jscProductDir):
(builtDylibPathForName):
(determineIsNix):
(isNix):
(isAppleWebKit):
(launcherPath):
(launcherName):
(checkRequiredSystemConfig):
(copyInspectorFrontendFiles):
(jhbuildWrapperPrefixIfNeeded):
(buildCMakeProjectOrExit):
(cmakeBasedPortName):
* Scripts/webkitpy/common/config/ports.py:
(DeprecatedPort.port):
(EflWK2Port.build_webkit_command):
(NixPort):
(NixPort.build_webkit_command):
* Scripts/webkitpy/port/factory.py:
(platform_options):
(PortFactory):
* Scripts/webkitpy/port/nix.py: Added.
(NixPort):
(NixPort._wk2_port_name):
(NixPort.determine_full_port_name):
(NixPort.__init__):
(NixPort._port_flag_for_scripts):
(NixPort.setup_test_run):
(NixPort.setup_environ_for_server):
(NixPort.default_timeout_ms):
(NixPort.clean_up_test_run):
(NixPort._generate_all_test_configurations):
(NixPort._path_to_driver):
(NixPort._path_to_image_diff):
(NixPort._image_diff_command):
(NixPort._search_paths):
(NixPort.show_results_html_file):
(NixPort._port_specific_expectations_files):
(NixPort.default_baseline_search_path):
* Scripts/webkitpy/port/nix_unittest.py: Added.
(NixPortTest):
(NixPortTest._assert_search_path):
(NixPortTest._assert_expectations_files):
(NixPortTest.test_baseline_search_path):
(NixPortTest.test_expectations_files):
(NixPortTest.test_default_timeout_ms):
* jhbuild/jhbuild-wrapper:
(determine_platform):
* nix/common.py: Added.
(script_path):
(top_level_path):
* nix/jhbuild.modules: Added.
* nix/jhbuildrc: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@159806 268f45cc-cd09-0410-ab3c-d52691b4dbfc