[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..eee240b75d841d7395b69f3c23f061b96bcc64f8 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_additionalMultiplier; // Includes accessibility font scale factor and device scale adjustment.

[skobes, 2014/01/13 19:10:13]

Perhaps "m_baseMultiplier"?

[pdr., 2014/01/13 19:49:12]

I like it. Done.

+#ifndef NDEBUG

[skobes, 2014/01/13 19:10:13]

Is the compiler not smart enough to strip out an unused field in the release
build?

[pdr., 2014/01/13 19:49:12]

Nowhere near smart enough :)

There are two reasons for using #ifndef NDEBUG here:
1) It will force a compile-time failure if we accidentally reference it outside
of a debug build
2) The compiler has a very local view of this class. For example, a separate
program could reference this object and would expect its layout (member
variables, etc) to be there. This is, of course, rare and maybe optimization
should be opt-out instead of opt-in, but that's a question for the c++ gods.

+    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