[GLib] Name more GSource-based RunLoop::Timers

[GLib] Name more GSource-based RunLoop::Timers
https://bugs.webkit.org/show_bug.cgi?id=172158

Reviewed by Carlos Garcia Campos.

Source/WebCore:

* platform/glib/MainThreadSharedTimerGLib.cpp:
(WebCore::MainThreadSharedTimer::MainThreadSharedTimer):
Specify 'MainThreadSharedTimer' as the name of this GSource-based RunLoop::Timer.

Source/WebKit2:

* Shared/CoordinatedGraphics/threadedcompositor/CompositingRunLoop.cpp:
(WebKit::CompositingRunLoop::CompositingRunLoop):
Specify 'CompositingRunLoop' as the name of this GSource-based RunLoop::Timer.
* Shared/CoordinatedGraphics/threadedcompositor/ThreadedDisplayRefreshMonitor.cpp:
(WebKit::ThreadedDisplayRefreshMonitor::ThreadedDisplayRefreshMonitor):
Specify 'ThreadedDisplayRefreshMonitor' as the name of this GSource-based RunLoop::Timer.
* WebProcess/WebPage/CoordinatedGraphics/CoordinatedLayerTreeHost.cpp:
(WebKit::CoordinatedLayerTreeHost::CoordinatedLayerTreeHost):
Specify 'CoordinatedLayerTreeHost' as the name of this GSource-based RunLoop::Timer.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@216927 268f45cc-cd09-0410-ab3c-d52691b4dbfc