cpp_headers_from_protos: hardcode relative path to buildtools clang-format am: dc407204e2
cpp_headers_from_protos: hardcode relative path to buildtools clang-format
am: dc407204e2

Change-Id: I13991d44e640760a5046d6c1bbd0105ae27595a2

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