Add Intel macOS workaround for WebGL2 canvas_sub_rectangle tests

content/browser/gpu/gpu_data_manager_impl_private.cc

Index: content/browser/gpu/gpu_data_manager_impl_private.cc
diff --git a/content/browser/gpu/gpu_data_manager_impl_private.cc b/content/browser/gpu/gpu_data_manager_impl_private.cc
index 78e7c4b36807678cf0cfe0b35b646731c8b40737..eb11093c9f5a17243be7052992eae170543bb6c6 100644
--- a/content/browser/gpu/gpu_data_manager_impl_private.cc
+++ b/content/browser/gpu/gpu_data_manager_impl_private.cc
@@ -878,6 +878,8 @@ void GpuDataManagerImplPrivate::UpdateRendererWebPrefs(
   prefs->disable_2d_canvas_copy_on_write =
       IsDriverBugWorkaroundActive(gpu::BROKEN_EGL_IMAGE_REF_COUNTING) &&
       command_line->HasSwitch(switches::kEnableThreadedTextureMailboxes);
+  prefs->force_redundant_2d_canvas_copy =
+      IsDriverBugWorkaroundActive(gpu::FORCE_REDUNDANT_2D_CANVAS_COPY);
 }
 
 void GpuDataManagerImplPrivate::DisableHardwareAcceleration() {