Capture/Replay: Add ability to override entry points We don't support populating a texture from an EGLImage, but this feature is in use by games. Instead, populate the texture with null data. In the future, improve this by reading back the data. Test: Capture and play back first 1200 frames of COD. Bug: b/164426913 Bug: angleproject:4048 Change-Id: Ic8c6bdf3c359c89e647c28b8c57b7218bdf05b15 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2355705 Reviewed-by: Manh Nguyen <nguyenmh@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Cody Northrop <cnorthrop@google.com>