Add enable.cc to TINT_SRCS to fix dawn bazel build

Change-Id: Ic93f264fb556ecf271f9c2642f7c60665669b092
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/534499
Commit-Queue: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Auto-Submit: Brian Salomon <bsalomon@google.com>
1 file changed