Make text visible when font loading takes longer than 3 seconds

Source/platform/fonts/SimpleFontData.h

Index: Source/platform/fonts/SimpleFontData.h
diff --git a/Source/platform/fonts/SimpleFontData.h b/Source/platform/fonts/SimpleFontData.h
index e43a2b0ad68fb72b6d4476cd05f6029ce6db7638..a4259f6d5d1b4937384392ab4b41fde9f4276ee5 100644
--- a/Source/platform/fonts/SimpleFontData.h
+++ b/Source/platform/fonts/SimpleFontData.h
@@ -147,6 +147,7 @@ public:
     virtual bool isLoading() const OVERRIDE { return m_customFontData ? m_customFontData->isLoading() : false; }
     virtual bool isLoadingFallback() const OVERRIDE { return m_customFontData ? m_customFontData->isLoadingFallback() : false; }
     virtual bool isSegmented() const OVERRIDE;
+    virtual bool shouldSkipDrawing() const OVERRIDE { return m_customFontData && m_customFontData->shouldSkipDrawing(); }
 
     const GlyphData& missingGlyphData() const { return m_missingGlyphData; }
     void setMissingGlyphData(const GlyphData& glyphData) { m_missingGlyphData = glyphData; }