DerivedSources.make should optionally include SupplementalDependencies.dep
https://bugs.webkit.org/show_bug.cgi?id=117972

Reviewed by Dan Bernstein.

make(1) logs a non-fatal error to stderr when an included Makefile can't
be found. This error is non-fatal because after make(1) reads in all the
Makefiles it runs the recipe for any rule that specifies one of the
Makefiles as a target. Only if the Makefile is still missing after
applying these rules does the error become fatal.

Since SupplementalDependencies.dep is generated by running a script on
SupplementalDependencies.txt, the file won't exist during clean builds.
Each time make(1) logs this non-fatal error, Xcode sees it and itself
logs a non-fatal error. This is annoying.

We don't care about this error. We only care if the recipe to generate
SupplementalDependencies.dep fails, which is already a fatal error.
Suppress the error by including SupplementalDependencies.dep optionally.

* DerivedSources.make:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@151955 268f45cc-cd09-0410-ab3c-d52691b4dbfc
Update AbstractWorker, Worker and SharedWorker to match the specification
https://bugs.webkit.org/show_bug.cgi?id=117930

Reviewed by Kentaro Hara.

Update AbstractWorker, Worker and SharedWorker to match the spec:
http://www.whatwg.org/specs/web-apps/current-work/multipage/workers.html#abstractworker
http://www.whatwg.org/specs/web-apps/current-work/multipage/workers.html#worker
http://www.whatwg.org/specs/web-apps/current-work/multipage/workers.html#sharedworker

Worker and SharedWorker no longer inherit from AbstractWorker. Web IDL 'implements'
statements are used instead. Worker and SharedWorker can now inherit from EventTarget
as per the specification.

No new tests, no behavior change.

* workers/AbstractWorker.idl:
* workers/SharedWorker.idl:
* workers/Worker.idl:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@151956 268f45cc-cd09-0410-ab3c-d52691b4dbfc