FrameCapture: Disable GL_OES_mapbuffer during capture Test: Capture PUBG Mobile Lite Bug: b/159238311 Bug: b/165824228 Change-Id: Idb9c29a963585c2f56e2fd134d77ee72bd2c53cb Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2504826 Commit-Queue: Cody Northrop <cnorthrop@google.com> Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org>