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When depending on multiple similar proto_library targets, each target
can create its own public_config. In the case of perfetto, this adds up
to about a dozen configs, each adding the exact same include path.

Because gn doesn't eliminate duplicate include paths (crbug.com/gn/142),
these configs end up adding duplicate -I command line flags to build
commands. On some bots, this recently caused us to exceed command line
length limits (see crbug.com/1043279).

This patch adds an invoker argument to the proto_library gn template,
which disables the public_config propgation of the proto_library target
and will allow perfetto to define and propagate a separate
public_config instead to avoid this duplication.

Bug: 1043279, gn:142
Change-Id: Ifa68c164b2b4c631bdaf98f63ba5bf7537e8e166
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2010860
Commit-Queue: Eric Seckler <eseckler@chromium.org>
Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734043}