We can't actually read them back at the moment, so this needs a proper
fix. In the meantime, the apps we are tracking don't need this value at
the beginning of the trace.

Test: Angry Birds 2 MEC
Bug: angleproject:3662
Bug: angleproject:4688
Bug: b/157672184
Change-Id: I67190092bcce7080edc69714f1ca1194c37d54fb
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2231802Reviewed-by: Manh Nguyen <nguyenmh@google.com>
Commit-Queue: Cody Northrop <cnorthrop@google.com>