[FastTextAutosizer] Incorporate accessibility and device scale factors

Source/core/rendering/FastTextAutosizer.h

Index: Source/core/rendering/FastTextAutosizer.h
diff --git a/Source/core/rendering/FastTextAutosizer.h b/Source/core/rendering/FastTextAutosizer.h
index d502164cd447fb6a33bab6ef4b883755182ce9d0..120d53ca1c0e80e1ddb4411efd7445f46fa4ac70 100644
--- a/Source/core/rendering/FastTextAutosizer.h
+++ b/Source/core/rendering/FastTextAutosizer.h
@@ -99,7 +99,7 @@ private:
     explicit FastTextAutosizer(Document*);
 
     bool enabled();
-    void prepareWindowInfo(RenderView*);
+    void prepareRenderViewInfo(RenderView*);
     bool shouldBeClusterRoot(RenderBlock*);
     bool clusterWantsAutosizing(RenderBlock*);
     AtomicString computeFingerprint(RenderBlock*);
@@ -113,6 +113,10 @@ private:
     Document* m_document;
     int m_windowWidth; // Frame width in density-independent pixels (DIPs).
     int m_layoutWidth; // Layout width in CSS pixels.
+    float m_baseMultiplier; // Includes accessibility font scale factor and device scale adjustment.
+#ifndef NDEBUG
+    bool m_renderViewInfoPrepared; // Used for assertions.
+#endif
 
     // Clusters are created and destroyed during layout. The map key is the
     // cluster root. Clusters whose roots share the same fingerprint use the