Timeline: Don't leak render pass states.

Change-Id: Ib19cd8cc76324e583ed79d8a660bb06a7b154a66
Reviewed-by: Kai Koehne <kai.koehne@theqtcompany.com>

src/libs/timeline/timelinerenderpass.cpp

@@ -54,6 +54,10 @@ QSGNode *TimelineRenderPass::State::collapsedOverlay() const
     return 0;
 }
 
+TimelineRenderPass::State::~State()
+{
+}
+
 TimelineRenderPass::~TimelineRenderPass() {}
 
 } // namespace Timeline

src/libs/timeline/timelinerenderpass.h

@@ -48,6 +48,7 @@ public:
         virtual const QVector<QSGNode *> &collapsedRows() const;
         virtual QSGNode *expandedOverlay() const;
         virtual QSGNode *collapsedOverlay() const;
+        virtual ~State();
     };
 
     virtual ~TimelineRenderPass();

src/libs/timeline/timelinerenderstate.cpp

@@ -58,6 +58,7 @@ TimelineRenderState::~TimelineRenderState()
     delete d->collapsedRowRoot;
     delete d->expandedOverlayRoot;
     delete d->collapsedOverlayRoot;
+    qDeleteAll(d->passes);
     delete d;
 }