This CL adds the following changes:
* Support variable block sizes for ASTC
* Support glMapBuffer
* Additional param captures

Test: Capture from beginning of Asphalt 8 and Aztec Ruins
Bug: b/150484427
Bug: b/160808198
Change-Id: Ic1041011c3f51c32dbf7bf7105f41dffb9460b87
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2264832
Commit-Queue: Cody Northrop <cnorthrop@google.com>
Reviewed-by: Manh Nguyen <nguyenmh@google.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>