CppTools: Add sourceFilePath to AbstractEditorSupport

Provide the source path to track a generated file source. You can for
example get the modified time stamp for the source file and use it for the
generated file content.

Task-number: QTCREATORBUG-21876
Change-Id: Ia422e128c5cb7a3dce88960f126152c2f65afb41
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>

src/plugins/clangcodemodel/clangmodelmanagersupport.cpp

@@ -293,6 +293,7 @@ void ClangModelManagerSupport::onCppDocumentContentsChangedOnUnsavedFile()
 }
 
 void ClangModelManagerSupport::onAbstractEditorSupportContentsUpdated(const QString &filePath,
+                                                                      const QString &,
                                                                       const QByteArray &content)
 {
     QTC_ASSERT(!filePath.isEmpty(), return);