https://bugs.webkit.org/show_bug.cgi?id=123116

Reviewed by Anders Carlsson.

* Shared/mac/RemoteLayerTreeTransaction.mm:
(WebKit::RemoteLayerTreeTextStream::RemoteLayerTreeTextStream):
(WebKit::RemoteLayerTreeTextStream::increaseIndent):
(WebKit::RemoteLayerTreeTextStream::decreaseIndent):
(WebKit::RemoteLayerTreeTextStream::writeIndent):
(WebKit::RemoteLayerTreeTextStream::operator<<):
Add some stream operator overrides for various types we need to dump.
Add a notion of current indent to our TextStream subclass to make it
easy to keep track of where we are.

(WebKit::dumpProperty):
Added, hand any arbitrary type to RemoteLayerTreeTransaction.

(WebKit::dumpChangedLayers):
(WebKit::RemoteLayerTreeTransaction::dump):
Make use of TextStream.

* WebCore.exp.in:
Export some TextStream functions.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@157731 268f45cc-cd09-0410-ab3c-d52691b4dbfc