Add field for internalFormat param to glTexImage to GrGLGpu::ConfigEntry.

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 e3b590f017b000f759e959bc323eb6f76ab1994e..a14095d88867bc009452c17c875b484e51b41097 100644
--- a/src/gpu/gl/GrGLGpu.h
+++ b/src/gpu/gl/GrGLGpu.h
@@ -553,6 +553,8 @@ private:
         // The <format> parameter to use for glTexImage and glTexSubImage.
         // This is usually the same as fExternalFormat except for kSRGBA on some GL contexts.
         GrGLenum fExternalFormatForTexImage;
+        // Either the base or sized internal format depending on the GL and config.
+        GrGLenum fInternalFormatTexImage;
 
         // Index into GrGLCaps's list of stencil formats. Support is determined experimentally and
         // lazily.