Use unorm shorts for texture coordinates when rendering text.

src/gpu/text/GrBatchFontCache.cpp

Index: src/gpu/text/GrBatchFontCache.cpp
diff --git a/src/gpu/text/GrBatchFontCache.cpp b/src/gpu/text/GrBatchFontCache.cpp
index ad76e4d71fa13e8ef7c9bcc26130b6a692e813b6..d99df1da0376ca59b742a925c577bb66827fdb8c 100644
--- a/src/gpu/text/GrBatchFontCache.cpp
+++ b/src/gpu/text/GrBatchFontCache.cpp
@@ -48,16 +48,22 @@ GrBatchFontCache::GrBatchFontCache(GrContext* context)
     // setup default atlas configs
     fAtlasConfigs[kA8_GrMaskFormat].fWidth = 2048;
     fAtlasConfigs[kA8_GrMaskFormat].fHeight = 2048;
+    fAtlasConfigs[kA8_GrMaskFormat].fLog2Width = 11;
+    fAtlasConfigs[kA8_GrMaskFormat].fLog2Height = 11;
     fAtlasConfigs[kA8_GrMaskFormat].fPlotWidth = 512;
     fAtlasConfigs[kA8_GrMaskFormat].fPlotHeight = 256;
 
     fAtlasConfigs[kA565_GrMaskFormat].fWidth = 1024;
     fAtlasConfigs[kA565_GrMaskFormat].fHeight = 2048;
+    fAtlasConfigs[kA565_GrMaskFormat].fLog2Width = 10;
+    fAtlasConfigs[kA565_GrMaskFormat].fLog2Height = 11;
     fAtlasConfigs[kA565_GrMaskFormat].fPlotWidth = 256;
     fAtlasConfigs[kA565_GrMaskFormat].fPlotHeight = 256;
 
     fAtlasConfigs[kARGB_GrMaskFormat].fWidth = 1024;
     fAtlasConfigs[kARGB_GrMaskFormat].fHeight = 2048;
+    fAtlasConfigs[kARGB_GrMaskFormat].fLog2Width = 10;
+    fAtlasConfigs[kARGB_GrMaskFormat].fLog2Height = 11;
     fAtlasConfigs[kARGB_GrMaskFormat].fPlotWidth = 256;
     fAtlasConfigs[kARGB_GrMaskFormat].fPlotHeight = 256;
 }