Use texture size to determine precision of texture coord varyings

src/gpu/gl/GrGLCaps.h

Index: src/gpu/gl/GrGLCaps.h
diff --git a/src/gpu/gl/GrGLCaps.h b/src/gpu/gl/GrGLCaps.h
index f84019335ca0cf424f074d42ae42d795a9224c0e..19e9b878dec171f42a7c1fdac0f8c4969c21e878 100644
--- a/src/gpu/gl/GrGLCaps.h
+++ b/src/gpu/gl/GrGLCaps.h
@@ -325,9 +325,10 @@ private:
     void initConfigRenderableTable(const GrGLContextInfo&);
     void initConfigTexturableTable(const GrGLContextInfo&, const GrGLInterface*);
 
-    bool doReadPixelsSupported(const GrGLInterface* intf,
-                                   GrGLenum format,
-                                   GrGLenum type) const;
+    // Must be called after fGeometryShaderSupport is initialized.
+    void initShaderPrecisionTable(const GrGLContextInfo&, const GrGLInterface*);
+
+    bool doReadPixelsSupported(const GrGLInterface* intf, GrGLenum format, GrGLenum type) const;
 
     // tracks configs that have been verified to pass the FBO completeness when
     // used as a color attachment