Using VK_QUERY_TYPE_TIMESTAMP to get timing per drawcall

[ramcn]

I am trying to use VK_QUERY_TYPE_TIMESTAMP profiling each draw call and get their timing. The summary of high-level code change is as below and attached is the patch. timestamp-patch.txt

But the time stamp values are all zero. Looking for some help to review the patch and if any suggestions on fixing the issue.

Part 1:
Create the querypool in Process_vkCreatePipelineLayout

Part2
Insert the timestamp before and after drawcall in Process_vkCmdDrawIndexed

Part3
Retrieve the timing in OverrideQueueSubmit and print them.

Problem
The timestamp values printed are all zero.