Perf sheriffing. <1% change in IO on moz page cycler.

tools/perf_expectations/perf_expectations.json

 {"linux-release-64/sizes/chrome-bss/bss": {"reva": 117429, "revb": 117430, "type": "absolute", "improve": 587620, "regress": 691837, "sha1": "9aa9b786"},
  "linux-release-64/sizes/chrome-data/data": {"reva": 135999, "revb": 136000, "type": "absolute", "better": "lower", "improve": 2551863, "regress": 2820481, "sha1": "f3ce82a6"},
  "linux-release-64/sizes/chrome-si/initializers": {"reva": 145035, "revb": 145035, "type": "absolute", "better": "lower", "improve": 43, "regress": 43, "tolerance": 0, "sha1": "fa5fa232"},
  "linux-release-64/sizes/chrome-text/text": {"reva": 140708, "revb": 140809, "type": "absolute", "better": "lower", "improve": 72677056, "regress": 80362461, "sha1": "3f8348cd"},
  "linux-release-64/sizes/chrome.pak/chrome.pak": {"reva": 144090, "revb": 146227, "type": "absolute", "better": "lower", "improve": 3707774, "regress": 4832382, "sha1": "d7e07c9a"},
  "linux-release-64/sizes/chrome/chrome": {"reva": 139125, "revb": 139137, "type": "absolute", "improve": 95385958, "regress": 105426695, "sha1": "b9639f5f"},
  "linux-release-64/sizes/nacl_helper-bss/bss": {"reva": 127301, "revb": 127334, "type": "absolute", "better": "lower", "improve": 348881, "regress": 385607, "sha1": "da9089b6"},
  "linux-release-64/sizes/nacl_helper-data/data": {"reva": 129061, "revb": 129076, "type": "absolute", "better": "lower", "improve": 33405, "regress": 36923, "sha1": "effeb881"},
  "linux-release-64/sizes/nacl_helper-si/initializers": {"reva": 120278, "revb": 120278, "type": "absolute", "better": "lower", "improve": 17, "regress": 19, "sha1": "77a7c319"},
  "linux-release-64/sizes/nacl_helper-text/text": {"reva": 147670, "revb": 147675, "type": "absolute", "better": "lower", "improve": 905631, "regress": 1000961, "sha1": "1234c90a"},
@@ skipping 405 matching lines @@
  "vista-release-single-core/startup/times/t": {"improve": -9, "regress": 9, "sha1": "cb61d833"},
  "xp-release-dual-core/dhtml/times/t": {"reva": 104424, "revb": 104645, "improve": -80, "regress": 1972, "sha1": "9f34f008"},
  "xp-release-dual-core/dom_perf/Total/score": {"reva": 116084, "revb": 116312, "improve": 160, "regress": 0, "sha1": "4d8353a0"},
  "xp-release-dual-core/dromaeo_domcore/dom/score": {"reva": 144704, "revb": 145298, "better": "higher", "improve": 60, "regress": -52, "sha1": "ef829b6f"},
  "xp-release-dual-core/dromaeo_jslib/jslib/score": {"reva": 144704, "revb": 145298, "better": "higher", "improve": 93, "regress": -12, "sha1": "b2a544dc"},
  "xp-release-dual-core/intl1/times/t": {"reva": 142932, "revb": 143642, "improve": -833, "regress": 103, "sha1": "6b55ef74"},
  "xp-release-dual-core/intl2/times/t": {"reva": 147678, "revb": 147799, "improve": -52, "regress": 73, "sha1": "ae6f4090"},
  "xp-release-dual-core/morejs/times/t": {"reva": 131574, "revb": 127228, "improve": -452, "regress": 456, "sha1": "21ef0dc0"},
  "xp-release-dual-core/moz/times/t": {"reva": 147678, "revb": 147799, "improve": -35, "regress": 61, "sha1": "0d686973"},
  "xp-release-dual-core/moz/total_byte_b/IO_b": {"reva": 147565, "revb": 148240, "improve": 176, "regress": 2496, "sha1": "5e972642"},
- "xp-release-dual-core/moz/total_byte_r/IO_r": {"reva": 148220, "revb": 148240, "improve": 358, "regress": 431, "sha1": "41aa8cef"},
+ "xp-release-dual-core/moz/total_byte_r/IO_r": {"reva": 148636, "revb": 148767, "improve": 253, "regress": 430, "sha1": "dfa2a845"},
  "xp-release-dual-core/moz/total_op_b/IO_op_b": {"reva": 141869, "revb": 142490, "improve": 169, "regress": 2089, "sha1": "2f018b43"},
- "xp-release-dual-core/moz/total_op_r/IO_op_r": {"reva": 148636, "revb": 148651, "improve": -188, "regress": -33, "sha1": "3891978b"},
+ "xp-release-dual-core/moz/total_op_r/IO_op_r": {"reva": 148636, "revb": 148767, "improve": -220, "regress": 136, "sha1": "fb000ffe"},
  "xp-release-dual-core/moz/vm_peak_b/vm_pk_b": {"reva": 137781, "revb": 138227, "improve": -1565492, "regress": 2464359, "sha1": "0e00a85f"},
  "xp-release-dual-core/moz/vm_peak_r/vm_pk_r": {"reva": 148248, "revb": 148263, "improve": -2468660, "regress": 79349760, "sha1": "c3a017fe"},
  "xp-release-dual-core/startup/warm/t": {"reva": 76825, "revb": 77094, "improve": -107, "regress": 141, "sha1": "e0dcf672"},
  "xp-release-dual-core/v8_benchmark/score/score": {"reva": 137754, "revb": 137799, "improve": 74, "regress": -208, "sha1": "f3b9c5d7"},
  "xp-release-single-core/dhtml/times/t": {"reva": 98602, "revb": 99994, "improve": -2888, "regress": 3391, "sha1": "30683762"},
  "xp-release-single-core/intl1/times/t": {"reva": 147685, "revb": 148133, "improve": -213, "regress": 21, "sha1": "ea3080ae"},
  "xp-release-single-core/intl2/times/t": {"reva": 141097, "revb": 142602, "improve": -849, "regress": 77, "sha1": "25c1c087"},
  "xp-release-single-core/morejs/times/t": {"reva": 141097, "revb": 142602, "improve": -308, "regress": 436, "sha1": "8282a308"},
  "xp-release-single-core/moz/times/t": {"reva": 75758, "revb": 76221, "improve": -1705, "regress": 3304, "sha1": "b615a416"},
  "xp-release-single-core/startup/times/t": {"improve": -9, "regress": 9, "sha1": "b1bf03da"},
  "xp-release/sizes/chrome.dll/chrome.dll": {"reva": 147669, "revb": 147717, "type": "absolute", "improve": 45019724, "regress": 49825306, "sha1": "a278eebe"},
  "xp-release/sizes/chrome.exe/chrome.exe": {"reva": 109519, "revb": 110703, "type": "absolute", "improve": 1116774, "regress": 1239706, "sha1": "69996492"},
  "xp-release/sizes/mini_installer.exe/mini_installer.exe": {"reva": 124098, "revb": 133304, "type": "absolute", "improve": 20609254, "regress": 24072653, "sha1": "e01f4d11"},
  "xp-release/sizes/setup.exe/setup.exe": {"reva": 128672, "revb": 128741, "type": "absolute", "improve": 1436825, "regress": 1588608, "sha1": "aba5e95e"},
  "load": true
 }