Add an internal usage option for copyTextureForBrowserOption
allowing internal calls from call to use canvas context
texture as source/destination.
Bug: chromium:1331139
Change-Id: Ida8421b3962a6434e8ef57c581c7a2e1d607954c
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/94985
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Shrek Shao <shrekshao@google.com>
Reviewed-by: Loko Kung <lokokung@google.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
