Clang: Add progress bars for creating PCHs and indexing

Task-number: QTCREATORBUG-21112
Change-Id: Ie0c00a58f479a2fe7cbc7322490808509733ff0f
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>

tests/unit/unittest/mockrefactoringserver.h

@@ -59,6 +59,9 @@ public:
     MOCK_METHOD0(cancel,
                  void());
 
+    MOCK_METHOD2(setProgress,
+                 void(int, int));
+
     void requestSourceLocationsForRenamingMessage(ClangBackEnd::RequestSourceLocationsForRenamingMessage &&message) override
     {
         requestSourceLocationsForRenamingMessage(message);