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This is needed in order to enable support for extension-based typed
tracing events. For more information, see
https://perfetto.dev/docs/design-docs/extensions

Change-Id: I43bd82ee1c94cf7ae5be0a1fd7db4104cf8ece6a
Bug: 161696674
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2332180Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Reviewed-by: Eric Seckler <eseckler@chromium.org>
Commit-Queue: Andrew Shulaev <ddrone@google.com>
Cr-Commit-Position: refs/heads/master@{#795191}