CppEditor: Tests: Add initial Follow Symbol Under Cursor tests

Test cases are examples from

    Working Draft, Standard for Programming Language C++
    Document Number: N3242=11-0012

Change-Id: I624c315943d6a00e821abb52eef6e0ff4a40f0d7
Reviewed-by: Przemyslaw Gorszkowski <pgorszkowski@gmail.com>
Reviewed-by: David Schulz <david.schulz@digia.com>

src/plugins/cpptools/cpptoolseditorsupport.cpp

@@ -164,6 +164,16 @@ unsigned CppEditorSupport::editorRevision() const
     return m_textEditor->editorWidget()->document()->revision();
 }
 
+bool CppEditorSupport::isDocumentBeingUpdated() const
+{
+    return m_documentParser.isRunning();
+}
+
+bool CppEditorSupport::isDocumentScheduledForUpdate() const
+{
+    return m_updateDocumentTimer->isActive();
+}
+
 void CppEditorSupport::setExtraDiagnostics(const QString &key,
                                            const QList<Document::DiagnosticMessage> &messages)
 {