[Tracing] Use TracingCategoryObserver in gc statistics
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}
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