CppTools: Allow to force a "Parsing" notification

Task-number: QTCREATORBUG-9597

Change-Id: I726a818c7d4af35dcb4863f74b08cd639a189bdd
Reviewed-by: Daniel Teske <daniel.teske@digia.com>

src/plugins/cpptools/cppmodelmanagerinterface.cpp

@@ -35,6 +35,20 @@
 
 #include <QtCore/QSet>
 
+/*!
+    \enum CppTools::CppModelManagerInterface::ProgressNotificationMode
+
+    This enum type specifies whether a progress bar notification should be
+    shown if more than one file is requested to update via
+    CppModelManagerInterface::updateSourceFiles().
+
+    \value ForcedProgressNotification
+           Notify regardless of the number of files requested for update.
+
+    \value ReservedProgressNotification
+           Notify only if more than one file is requested for update.
+*/
+
 /*!
     \enum CppTools::CppModelManagerInterface::QtVersion
     Allows C++ parser engine to inject headers or change inner settings as