Update expectations for v8 roll to 3.12.19 and skia roll to 4904.

tools/perf_expectations/perf_expectations.json

Index: tools/perf_expectations/perf_expectations.json
diff --git a/tools/perf_expectations/perf_expectations.json b/tools/perf_expectations/perf_expectations.json
index 01338350be1f9a41fb890f11a3ce53f6ebd38006..3542428686e235f4b0c22dd86bdad5dc4caed8ca 100644
--- a/tools/perf_expectations/perf_expectations.json
+++ b/tools/perf_expectations/perf_expectations.json
@@ -35,7 +35,7 @@
  "linux-release/dom_perf/Total/score": {"reva": 148221, "revb": 148261, "improve": 102, "regress": 18, "sha1": "8c9c43eb"},
  "linux-release/dromaeo_jslib/jslib/score": {"reva": 144704, "revb": 145298, "better": "higher", "improve": 39, "regress": -6, "sha1": "a33d92a1"},
  "linux-release/intl1/times/t": {"reva": 143878, "revb": 143908, "improve": -320, "regress": -170, "sha1": "9b3e7d33"},
- "linux-release/intl2/times/t": {"reva": 143878, "revb": 143908, "improve": -426, "regress": -268, "sha1": "426986de"},
+ "linux-release/intl2/times/t": {"reva": 149625, "revb": 149636, "improve": -297, "regress": -218, "sha1": "bced63df"},
  "linux-release/media_tests_av_perf/audio_latency/latency": {"reva": 143995, "revb": 144097, "type": "absolute", "better": "lower", "improve": 31, "regress": 55, "sha1": "c8079ca0"},
  "linux-release/media_tests_av_perf/audio_latency/latency_bg_clip": {"reva": 143995, "revb": 144097, "type": "absolute", "better": "lower", "improve": 95, "regress": 156, "sha1": "64584dac"},
  "linux-release/media_tests_av_perf/cpu/crowd1080.webm": {"reva": 143995, "revb": 144097, "type": "absolute", "better": "lower", "improve": 26, "regress": 34, "sha1": "584ed6e7"},
@@ -395,7 +395,7 @@
  "mac-release-10.6/morejs/times/t": {"reva": 67956, "revb": 69048, "improve": -2546, "regress": 2597, "sha1": "f8cbaca1"},
  "mac-release-10.6/moz/times/t": {"reva": 68096, "revb": 69048, "improve": -3314, "regress": 2668, "sha1": "fe58113c"},
  "mac-release-10.6/startup/times/t": {"improve": -2, "regress": 22, "sha1": "132f6c77"},
- "mac-release-10.6/v8_benchmark/score/score": {"reva": 141208, "revb": 141737, "improve": 26, "regress": -275, "sha1": "95465de0"},
+ "mac-release-10.6/v8_benchmark/score/score": {"reva": 149403, "revb": 149635, "improve": 11, "regress": -502, "sha1": "93b5c561"},
  "mac-release/sizes/Chromium.app/Chromium.app": {"reva": 143606, "revb": 143606, "type": "absolute", "better": "lower", "improve": 87801036, "regress": 97043252, "sha1": "06d9fe6d"},
  "mac-release/sizes/Chromium/Chromium": {"reva": 143606, "revb": 143606, "type": "absolute", "better": "lower", "improve": 8291, "regress": 9165, "sha1": "2684fd2e"},
  "mac-release/sizes/ChromiumFramework/ChromiumFramework": {"reva": 143606, "revb": 143606, "type": "absolute", "better": "lower", "improve": 62256589, "regress": 68809915, "sha1": "43182446"},