There is an unused rowBytes parameter being passed along.

src/gpu/gl/GrGLGpu.h

Index: src/gpu/gl/GrGLGpu.h
diff --git a/src/gpu/gl/GrGLGpu.h b/src/gpu/gl/GrGLGpu.h
index ec93bbfe21492b0b48226065398814eb14ef7a8b..bbe87c46a0555b748de8e302f5ae33ab25b3f7fe 100644
--- a/src/gpu/gl/GrGLGpu.h
+++ b/src/gpu/gl/GrGLGpu.h
@@ -64,7 +64,7 @@ public:
                              ReadPixelTempDrawInfo*) override;
 
     bool onGetWritePixelsInfo(GrSurface* dstSurface, int width, int height,
-                              size_t rowBytes, GrPixelConfig srcConfig, DrawPreference*,
+                              GrPixelConfig srcConfig, DrawPreference*,
                               WritePixelTempDrawInfo*) override;
 
     bool initCopySurfaceDstDesc(const GrSurface* src, GrSurfaceDesc* desc) const override;