Revert "gpuDrawTime should default to 0 when endTime is unknown"

This reverts commit 95cf4e70883d56acdb5da40052c5f77713e592e6.

Reason for revert: the fix is not working and also found that it is set to -1 on purpose

Change-Id: I3ea5553606a7824ba23909b0e36b2538d0f3d29f
1 file changed