Capture/Replay: Update unpack state in Shared MEC The shared context state MEC performed by CaptureSharedContextMidExecutionSetup() needs to include updating the pixel unpack state before capturing texture contents. Otherwise, computeRowPitch() will compute the wrong value, leading to a crash in memcpy() when capturing Pokemon GO. Bug: angleproject:6203 Change-Id: Id1b2d0b4f3bc79e615778ba513f50aabaeb4a56e Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3044356 Commit-Queue: Tim Van Patten <timvp@google.com> Reviewed-by: Cody Northrop <cnorthrop@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org>