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Add a trace for the call to add_reserved_diagnostics to help debug.

Bug: chromium:1133791
Change-Id: I2a94feda38d6de9f7be7992dacde064e2d1458b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2441199
Auto-Submit: Wenbin Zhang <wenbinzhang@google.com>
Commit-Queue: Wenbin Zhang <wenbinzhang@google.com>
Commit-Queue: John Chen <johnchen@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812400}