protozero: Avoid constructing temporary strings when parsing C++ messages am: b052f01964
protozero: Avoid constructing temporary strings when parsing C++ messages am: b052f01964

Original change: https://android-review.googlesource.com/c/platform/external/perfetto/+/1508179

Change-Id: Icc75378fd7b28ab6ec86948fb92c37c7be50c320

google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto