Put LayoutAnalyzer back behind disabled-by-default-blink.debug.layout.

Source/core/frame/FrameView.h

Index: Source/core/frame/FrameView.h
diff --git a/Source/core/frame/FrameView.h b/Source/core/frame/FrameView.h
index 695312d437f22c9c6a58e024aaae0ddddda96911..9ff3829a9781ec11f422ee487b3c465f2eabc7cd 100644
--- a/Source/core/frame/FrameView.h
+++ b/Source/core/frame/FrameView.h
@@ -576,7 +576,7 @@ public:
 
     int viewportWidth() const;
 
-    LayoutAnalyzer& layoutAnalyzer() { return m_analyzer; }
+    LayoutAnalyzer* layoutAnalyzer() { return m_analyzer.get(); }
 
 protected:
     // Scroll the content via the compositor.
@@ -717,6 +717,7 @@ private:
 
     ScrollingCoordinator* scrollingCoordinator();
 
+    void prepareLayoutAnalyzer();
     PassRefPtr<TracedValue> analyzerCounters();
 
     // LayoutObject for the viewport-defining element (see Document::viewportDefiningElement).
@@ -850,7 +851,7 @@ private:
 
     bool m_clipsRepaints;
 
-    LayoutAnalyzer m_analyzer;
+    OwnPtr<LayoutAnalyzer> m_analyzer;
 };
 
 inline void FrameView::incrementVisuallyNonEmptyCharacterCount(unsigned count)