There is an unused rowBytes parameter being passed along.

src/gpu/gl/GrGLGpu.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGLGpu_DEFINED
 #define GrGLGpu_DEFINED
 
@@ skipping 46 matching lines @@
     void discard(GrRenderTarget*) override;
 
     // Used by GrGLProgram to configure OpenGL state.
     void bindTexture(int unitIdx, const GrTextureParams& params, GrGLTexture* texture);
 
     bool onGetReadPixelsInfo(GrSurface* srcSurface, int readWidth, int readHeight, size_t rowBytes,
                              GrPixelConfig readConfig, DrawPreference*,
                              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;
 
     // These functions should be used to bind GL objects. They track the GL state and skip redundant
     // bindings. Making the equivalent glBind calls directly will confuse the state tracking.
     void bindVertexArray(GrGLuint id) {
         fHWGeometryState.setVertexArrayID(this, id);
     }
     void bindIndexBufferAndDefaultVertexArray(GrGLuint id) {
@@ skipping 507 matching lines @@
     } fPLSSetupProgram;
 
     bool fHWPLSEnabled;
     bool fPLSHasBeenUsed;
 
     typedef GrGpu INHERITED;
     friend class GrGLPathRendering; // For accessing setTextureUnit.
 };
 
 #endif