AutoTest: Make results tree a real tree

Provide a way to control how the results tree will be
generated for the respective test framework and use
this information to construct a real tree.
Basically this changes the layout of Qt test results,
but keeps the former layout of Google test results.

Task-number: QTCREATORBUG-17104
Change-Id: I7fca4d8e365bfebcca4cf7855cf6a882e5379143
Reviewed-by: David Schulz <david.schulz@qt.io>
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/autotest/gtest/gtestresult.cpp

@@ -52,5 +52,14 @@ const QString GTestResult::outputString(bool selected) const
     return output;
 }
 
+bool GTestResult::isDirectParentOf(const TestResult *other, bool *needsIntermediate) const
+{
+    if (!TestResult::isDirectParentOf(other, needsIntermediate))
+        return false;
+
+    const GTestResult *gtOther = static_cast<const GTestResult *>(other);
+    return isTest() && gtOther->isTestSet();
+}
+
 } // namespace Internal
 } // namespace Autotest