• lpy's avatar
    [Tracing] Use TracingCategoryObserver in gc statistics · 7d28301d
    lpy authored
    This patch is a follow-up patch to enable gc statistics to use
    TracingCategoryObserver.
    
    Previously we need to pass --track_gc_object_stats to v8 if we want to enable
    gc statistics in tracing. In this patch, we introducce an integer flag
    FLAG_gc_stats, and FLAG_track_gc_object_stats and FLAG_trace_gc_object_stats
    will set it to 0x01, tracing will set it to 0x10 when we start tracing and
    reset the bit when we stop tracing.
    
    BUG=v8:5590
    
    Review-Url: https://codereview.chromium.org/2459903003
    Cr-Commit-Position: refs/heads/master@{#40817}
    7d28301d
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