Modify workaround to never set base or max texture level for GL_TEXTURE_EXTERNAL_OES

Bug: https://github.com/flutter/flutter/issues/23900
Bug: https://github.com/flutter/flutter/issues/24402
Bug: https://github.com/flutter/flutter/issues/24391

Change-Id: I8b24a62618ecd19387bcb8a827030d0c6d5b5362
Reviewed-on: https://skia-review.googlesource.com/c/173363
Commit-Queue: Brian Salomon <bsalomon@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
Auto-Submit: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
(cherry picked from commit f3841931ef5f6e1636ce698fe06602d9db6fc5d4)
Reviewed-on: https://skia-review.googlesource.com/c/173425
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Todd Volkert <tvolkert@google.com>
3 files changed