Make copyTexImage2D robust when source area is out of bounds Whenever the source area of the texture being copied is out of bounds and robust resource init is enabled, it is necessary to clear the invalid portion of the source area to 0 in the copy operation. Bug: angleproject:3930 Change-Id: If1605b917097006c37e7d59c66babbc32d0ba6d8 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2378004 Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: back sept 10 - Jamie Madill <jmadill@chromium.org> Commit-Queue: Alexis Hétu <sugoi@chromium.org>