Add chromium events for dynamo compile time debugging (#174641)
Summary:
With this PR, the perfetto traces in tlparse wil have more info in arguments section of Dynamo bytecode_tracer - specifically fake tensor prop and Fx graph insertion
For example, for llama70B vllm model, we spend 50% of time in non-variable tracker stuff
<img width="1058" height="548" alt="image" src="https://github.com/user-attachments/assets/b1fb64ca-a567-4cde-9e16-c026e712a2b5" />
However for an internal model, we spend less than 20% - this shows that Dynamo is spending more time tracing code here
<img width="659" height="415" alt="image" src="https://github.com/user-attachments/assets/1cb80a00-b4ba-4180-bb98-47f0cf7c2c63" />
This can be useful for first order compile time debugging.
X-link: https://github.com/pytorch/pytorch/pull/174641
Approved by: https://github.com/williamwen42
ghstack dependencies: #174598
Reviewed By: seemethere
Differential Revision: D92883044
fbshipit-source-id: 1bd16e51099c2cf28995039abdc8e9e67cfe07e7