QmlProfiler: Methods for dispatching events by feature

When announcing features models have to provide functions that handle
events for those features now. The model manager gets a function to
dispatch events to the models that subscribe to them.

Change-Id: I3fd80443a68ba264a513d8d53ed473cf072f1dc7
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>

src/plugins/qmlprofiler/memoryusagemodel.cpp

@@ -33,7 +33,8 @@ namespace Internal {
 MemoryUsageModel::MemoryUsageModel(QmlProfilerModelManager *manager, QObject *parent) :
     QmlProfilerTimelineModel(manager, MemoryAllocation, MaximumRangeType, ProfileMemory, parent)
 {
-    announceFeatures((1ULL << mainFeature()) | Constants::QML_JS_RANGE_FEATURES);
+    // Announce additional features. The base class already announces the main feature.
+    announceFeatures(Constants::QML_JS_RANGE_FEATURES);
 }
 
 int MemoryUsageModel::rowMaxValue(int rowNumber) const