QmlProfiler: Document which thread scene graph events come from
QmlProfiler: Document which thread scene graph events come from

It's very nice to see that at a glance, rather than searching around
in the code.

Change-Id: I1d1cdf10d98578ca1fe3275fdf2dfc98f6499eed
Reviewed-by: Kai Koehne <077bc265216106fb22408e62f2d97925ede69d10@digia.com>

kuba1/qtcreator,kuba1/qtcreator,xianian/qt-creator,Distrotech/qtcreator,xianian/qt-creator,martyone/sailfish-qtcreator,farseerri/git_code,AltarBeastiful/qt-creator,martyone/sailfish-qtcreator,Distrotech/qtcreator,danimo/qt-creator,xianian/qt-creator,Distrotech/qtcreator,danimo/qt-creator,amyvmiwei/qt-creator,martyone/sailfish-qtcreator,farseerri/git_code,kuba1/qtcreator,xianian/qt-creator,AltarBeastiful/qt-creator,farseerri/git_code,kuba1/qtcreator,AltarBeastiful/qt-creator,martyone/sailfish-qtcreator,martyone/sailfish-qtcreator,danimo/qt-creator,kuba1/qtcreator,danimo/qt-creator,martyone/sailfish-qtcreator,AltarBeastiful/qt-creator,amyvmiwei/qt-creator,danimo/qt-creator,AltarBeastiful/qt-creator,xianian/qt-creator,amyvmiwei/qt-creator,danimo/qt-creator,Distrotech/qtcreator,Distrotech/qtcreator,xianian/qt-creator,kuba1/qtcreator,AltarBeastiful/qt-creator,kuba1/qtcreator,amyvmiwei/qt-creator,xianian/qt-creator,martyone/sailfish-qtcreator,danimo/qt-creator,kuba1/qtcreator,Distrotech/qtcreator,amyvmiwei/qt-creator,amyvmiwei/qt-creator,danimo/qt-creator,farseerri/git_code,kuba1/qtcreator,AltarBeastiful/qt-creator,martyone/sailfish-qtcreator,danimo/qt-creator,AltarBeastiful/qt-creator,xianian/qt-creator,amyvmiwei/qt-creator,Distrotech/qtcreator,xianian/qt-creator,farseerri/git_code,farseerri/git_code,amyvmiwei/qt-creator,farseerri/git_code,farseerri/git_code,martyone/sailfish-qtcreator