Disable unpack row length when uploading mips

src/gpu/gl/GrGLGpu.cpp

Index: src/gpu/gl/GrGLGpu.cpp
diff --git a/src/gpu/gl/GrGLGpu.cpp b/src/gpu/gl/GrGLGpu.cpp
index 027d9527c09bd7800a725badd67325cefa254a21..8a3416b74f3b7b6a2d9150b5c5e55d01beca290d 100644
--- a/src/gpu/gl/GrGLGpu.cpp
+++ b/src/gpu/gl/GrGLGpu.cpp
@@ -1278,7 +1278,12 @@ bool GrGLGpu::uploadTexData(const GrSurfaceDesc& desc,
         restoreGLRowLength = false;
 
         const size_t rowBytes = texelsShallowCopy[currentMipLevel].fRowBytes;
-        if (caps.unpackRowLengthSupport() && !swFlipY) {
+      
+        // TODO: This optimization should be enabled with or without mips.
+        // For use with mips, we must set GR_GL_UNPACK_ROW_LENGTH once per
+        // mip level, before calling glTexImage2D.
+        const bool usesMips = texelsShallowCopy.count() > 1;
+        if (caps.unpackRowLengthSupport() && !swFlipY && !usesMips) {
             // can't use this for flipping, only non-neg values allowed. :(
             if (rowBytes != trimRowBytes) {
                 GrGLint rowLength = static_cast<GrGLint>(rowBytes / bpp);