1"flat_key","key","int_value","string_value" 2"is_root_in_scope","is_root_in_scope",1,"[NULL]" 3"source","source","[NULL]","descriptor" 4"source_id","source_id",0,"[NULL]" 5"chrome_histogram_sample.name","chrome_histogram_sample.name","[NULL]","Compositing.Display.DrawToSwapUs" 6"chrome_histogram_sample.name_hash","chrome_histogram_sample.name_hash",10,"[NULL]" 7"chrome_histogram_sample.name_iid","chrome_histogram_sample.name_iid",1,"[NULL]" 8"chrome_histogram_sample.sample","chrome_histogram_sample.sample",100,"[NULL]" 9"chrome_histogram_sample.name","chrome_histogram_sample.name","[NULL]","CompositorLatency.TotalLatency" 10"chrome_histogram_sample.name_hash","chrome_histogram_sample.name_hash",20,"[NULL]" 11"chrome_histogram_sample.name_iid","chrome_histogram_sample.name_iid",2,"[NULL]" 12"chrome_histogram_sample.sample","chrome_histogram_sample.sample",200,"[NULL]" 13"chrome_histogram_sample.name","chrome_histogram_sample.name","[NULL]","Graphics.Smoothness.Checkerboarding.MainThreadAnimation" 14"chrome_histogram_sample.name_hash","chrome_histogram_sample.name_hash",30,"[NULL]" 15"chrome_histogram_sample.name_iid","chrome_histogram_sample.name_iid",3,"[NULL]" 16"chrome_histogram_sample.sample","chrome_histogram_sample.sample",300,"[NULL]" 17"chrome_histogram_sample.name_hash","chrome_histogram_sample.name_hash",40,"[NULL]" 18"chrome_histogram_sample.name_iid","chrome_histogram_sample.name_iid",4,"[NULL]" 19"chrome_histogram_sample.sample","chrome_histogram_sample.sample",400,"[NULL]" 20"chrome_histogram_sample.name_hash","chrome_histogram_sample.name_hash",50,"[NULL]" 21"chrome_histogram_sample.sample","chrome_histogram_sample.sample",500,"[NULL]" 22"chrome_histogram_sample.name","chrome_histogram_sample.name","[NULL]","Memory.GPU.PeakMemoryUsage.PageLoad" 23"chrome_histogram_sample.name_hash","chrome_histogram_sample.name_hash",60,"[NULL]" 24"chrome_histogram_sample.sample","chrome_histogram_sample.sample",600,"[NULL]" 25