In third_party/WebKit/Source/platform/heap/ThreadState.cpp
the tool rewrites something like this (with relatively nice alignment of the backslashes):

#define SNAPSHOT_HEAP(ArenaType)                                                                \
    {                                                                                          \
        numberOfHeapsReported++;                                                               \
        switch (type) {                                                                        \
        case SnapshotType::HeapSnapshot:                                                       \
            m_arenas[BlinkGC::ArenaType##ArenaIndex]->takeSnapshot(heapsDumpName + "/" #ArenaType, info);   \
            break;                                                                             \
        case SnapshotType::FreelistSnapshot:                                                   \
            m_arenas[BlinkGC::ArenaType##ArenaIndex]->takeFreelistSnapshot(heapsDumpName + "/" #ArenaType); \
            break;                                                                             \
        default:                                                                               \
            ASSERT_NOT_REACHED();                                                              \
        }                                                                                      \
    }

into something like this (notice the unaligned backslashes at the end of lines):

#define SNAPSHOT_HEAP(ArenaType)                                                                \
    {                                                                                          \
        number_of_heaps_reported++;                                                               \
        switch (type) {                                                                        \
        case SnapshotType::kHeapSnapshot:                                                       \
            arenas_[BlinkGC::ArenaType##ArenaIndex]->TakeSnapshot(heaps_dump_name + "/" #ArenaType, info);   \
            break;                                                                             \
        case SnapshotType::kFreelistSnapshot:                                                   \
            arenas_[BlinkGC::ArenaType##ArenaIndex]->TakeFreelistSnapshot(heaps_dump_name + "/" #ArenaType); \
            break;                                                                             \
        default:                                                                               \
            ASSERT_NOT_REACHED();                                                              \
        }                                                                                      \
    }