Move set_process_name from TraceLog to CurrentProcess

Allow the code to use CurrentProcess in base to set process_name(eg.
Browser, Renderer etc.) and process_type to allow splitting
tasks/IPCs per process instead of TraceLog.

Bug: b/242853904
Change-Id: I04e8609baede826f91ab261dd486d53ed22051be
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3997531


Commit-Queue: Aman Verma <amanvr@google.com>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1071557}