Don't try to add large glyphs to the font atlas.

src/gpu/GrTextStrike.h

Index: src/gpu/GrTextStrike.h
diff --git a/src/gpu/GrTextStrike.h b/src/gpu/GrTextStrike.h
index a5bb6ae5db0e54514d75e50119a9db80071a72a2..401bd7325909aa39be8a2e0ee655e1a08cf3f3e9 100644
--- a/src/gpu/GrTextStrike.h
+++ b/src/gpu/GrTextStrike.h
@@ -37,6 +37,10 @@ public:
     GrTexture*   getTexture() const { return fAtlas->getTexture(); }
 
     inline GrGlyph* getGlyph(GrGlyph::PackedID, GrFontScaler*);
+    // returns true if glyph (or glyph+padding for distance field)
+    // is too large to ever fit in texture atlas subregions (GrPlots)
+    bool glyphTooLargeForAtlas(GrGlyph*);
+    // returns true if glyph successfully added to texture atlas, false otherwise
     bool addGlyphToAtlas(GrGlyph*, GrFontScaler*);
 
     // testing