Introduce WPTServe for running W3C Blink Layout tests

Tools/Scripts/webkitpy/thirdparty/wpt/wpt/tools/localpaths.py

Index: Tools/Scripts/webkitpy/thirdparty/wpt/wpt/tools/localpaths.py
diff --git a/Tools/Scripts/webkitpy/thirdparty/wpt/wpt/tools/localpaths.py b/Tools/Scripts/webkitpy/thirdparty/wpt/wpt/tools/localpaths.py
new file mode 100644
index 0000000000000000000000000000000000000000..dcd19c35b33798555f2f96727c82b0f4998d432d
--- /dev/null
+++ b/Tools/Scripts/webkitpy/thirdparty/wpt/wpt/tools/localpaths.py
@@ -0,0 +1,11 @@
+import os

[Dirk Pranke, 2015/06/15 23:41:48]

Can we drop this file from the import? I don't think we need it ...

[burnik, 2015/06/16 09:24:34]

This is third party code (run as part of WPT serve).
If I start here, I'll change the whole thing, which will kill the effort
to use third party updates. :-)

[Dirk Pranke, 2015/06/17 04:19:39]

I don't understand; can't you just remove localpaths.py from the list 
in WPTWhitelist and re-run the checkout script so that we're not
adding this file?

Maybe I don't understand your concern?

[burnik, 2015/06/17 08:24:27]

It's being imported in thirdparty/wpt/wpt/tools/serve.py 
from .. import localpaths

So I could possibly get rid of it, however, then the changes to the third party
code are no longer just pure "reduction" in terms of deleting files, it would
require
actual changes to the code itself (hence even more difficult to get updates).

Ideally we would be using a single file for the whole WPTServe and not care
about this at all.
It would be nice if WPT contributors had some API release plan with at least
some guarantees so we could transition to newer versions easier... 

I am thinking about writing some small integration tests to help this
transitioning process for the future. I am sure that wptserve and wpt-tools will
get a bunch of updates and some of them are bound to be a breaking change for
us.

We should discuss this further in the design doc.

+import sys
+
+here = os.path.abspath(os.path.split(__file__)[0])
+repo_root = os.path.abspath(os.path.join(here, os.pardir))
+
+sys.path.insert(0, os.path.join(repo_root, "tools"))
+sys.path.insert(0, os.path.join(repo_root, "tools", "six"))
+sys.path.insert(0, os.path.join(repo_root, "tools", "html5lib"))
+sys.path.insert(0, os.path.join(repo_root, "tools", "wptserve"))
+sys.path.insert(0, os.path.join(repo_root, "tools", "pywebsocket", "src"))