Mesa ES 3.0 requires sized internal formats

src/gpu/gl/GrGpuGL.cpp

Index: src/gpu/gl/GrGpuGL.cpp
diff --git a/src/gpu/gl/GrGpuGL.cpp b/src/gpu/gl/GrGpuGL.cpp
index 73dd9bb15c1714e62b02d0772499fc72c6575f6c..f1684b7fdeb8da4213711d1f20f0853639936b46 100644
--- a/src/gpu/gl/GrGpuGL.cpp
+++ b/src/gpu/gl/GrGpuGL.cpp
@@ -568,7 +568,8 @@ bool GrGpuGL::uploadTexData(const GrSurfaceDesc& desc,
     // At least some versions of the ES3 drivers for NVIDIA and IMG won't accept GL_RED in
     // glTexImage2D for the internal format but will accept GL_R8.
     if (kNVIDIA_GrGLVendor == this->glContext().vendor() ||
-        kImagination_GrGLVendor == this->glContext().vendor()) {
+        kImagination_GrGLVendor == this->glContext().vendor() ||
+        this->glContext().isMesa()) {
         if (kGLES_GrGLStandard == this->glStandard() && this->glVersion() >= GR_GL_VER(3, 0) &&
             kAlpha_8_GrPixelConfig == dataConfig) {
            useSizedFormat = true;