There is an unused rowBytes parameter being passed along.

src/gpu/GrGpu.cpp

Index: src/gpu/GrGpu.cpp
diff --git a/src/gpu/GrGpu.cpp b/src/gpu/GrGpu.cpp
index ab8e5cb5359a4e025f748a89a0db69fc365c6313..911b906a6947018e87faa3dd9a0baf445622c88a 100644
--- a/src/gpu/GrGpu.cpp
+++ b/src/gpu/GrGpu.cpp
@@ -268,7 +268,7 @@ bool GrGpu::getReadPixelsInfo(GrSurface* srcSurface, int width, int height, size
 
     return true;
 }
-bool GrGpu::getWritePixelsInfo(GrSurface* dstSurface, int width, int height, size_t rowBytes,
+bool GrGpu::getWritePixelsInfo(GrSurface* dstSurface, int width, int height,
                                GrPixelConfig srcConfig, DrawPreference* drawPreference,
                                WritePixelTempDrawInfo* tempDrawInfo) {
     SkASSERT(drawPreference);
@@ -286,7 +286,7 @@ bool GrGpu::getWritePixelsInfo(GrSurface* dstSurface, int width, int height, siz
         ElevateDrawPreference(drawPreference, kRequireDraw_DrawPreference);
     }
 
-    if (!this->onGetWritePixelsInfo(dstSurface, width, height, rowBytes, srcConfig, drawPreference,
+    if (!this->onGetWritePixelsInfo(dstSurface, width, height, srcConfig, drawPreference,
                                     tempDrawInfo)) {
         return false;
     }