Allow setting of GrBatchFontCache atlas sizes

src/gpu/GrBatchFontCache.h

Index: src/gpu/GrBatchFontCache.h
diff --git a/src/gpu/GrBatchFontCache.h b/src/gpu/GrBatchFontCache.h
index f315a3eb7773b50cc612c2502065c06cbeb16399..fc2f3b7a29f413259a4792a4796384e6b2feb4ed 100644
--- a/src/gpu/GrBatchFontCache.h
+++ b/src/gpu/GrBatchFontCache.h
@@ -166,8 +166,12 @@ public:
         return this->getAtlas(format)->atlasGeneration();
     }
 
+    ///////////////////////////////////////////////////////////////////////////
+    // Functions intended debug only
     void dump() const;
 
+    void setAtlasSizes_ForTesting(const GrBatchAtlasConfig configs[3]);
+
 private:
     static GrPixelConfig MaskFormatToPixelConfig(GrMaskFormat format) {
         static const GrPixelConfig kPixelConfigs[] = {
@@ -213,6 +217,7 @@ private:
     SkTDynamicHash<GrBatchTextStrike, GrFontDescKey> fCache;
     GrBatchAtlas* fAtlases[kMaskFormatCount];
     GrBatchTextStrike* fPreserveStrike;
+    GrBatchAtlasConfig fAtlasConfigs[kMaskFormatCount];
 };
 
 #endif