Adjust atlas sizes to fix Mali400 precision issues

src/gpu/effects/GrBitmapTextGeoProc.cpp

Index: src/gpu/effects/GrBitmapTextGeoProc.cpp
diff --git a/src/gpu/effects/GrBitmapTextGeoProc.cpp b/src/gpu/effects/GrBitmapTextGeoProc.cpp
index 54e88917ad0cf0f071a2384c9866ccb839f3f774..2c187a9dcf76cbfb2feedb539f13de722eebda4f 100644
--- a/src/gpu/effects/GrBitmapTextGeoProc.cpp
+++ b/src/gpu/effects/GrBitmapTextGeoProc.cpp
@@ -39,9 +39,15 @@ public:
         GrGLVertToFrag v(kVec2f_GrSLType);
         pb->addVarying("TextureCoords", &v);
         // this is only used with text, so our texture bounds always match the glyph atlas
-        vsBuilder->codeAppendf("%s = vec2(" GR_FONT_ATLAS_RECIP_WIDTH ", "
-                               GR_FONT_ATLAS_RECIP_HEIGHT ")*%s;", v.vsOut(),
-                               cte.inTextureCoords()->fName);
+        if (cte.maskFormat() == kA8_GrMaskFormat) {
+            vsBuilder->codeAppendf("%s = vec2(" GR_FONT_ATLAS_A8_RECIP_WIDTH ", "
+                                   GR_FONT_ATLAS_RECIP_HEIGHT ")*%s;", v.vsOut(),
+                                   cte.inTextureCoords()->fName);
+        } else {
+            vsBuilder->codeAppendf("%s = vec2(" GR_FONT_ATLAS_RECIP_WIDTH ", "
+                                   GR_FONT_ATLAS_RECIP_HEIGHT ")*%s;", v.vsOut(),
+                                   cte.inTextureCoords()->fName);
+        }
 
         // Setup pass through color
         this->setupColorPassThrough(pb, local.fInputColorType, args.fOutputColor, cte.inColor(),