[gold] byblameentry-sk-demo.js: Make demo page deterministic by faking Date.now.

Bug: skia:9525
Change-Id: I13dad4a8465cb53cbed04dcc1fff1989ae320dae
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/264677
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Leandro Lovisolo <lovisolo@google.com>
diff --git a/golden/modules/byblameentry-sk/byblameentry-sk-demo.js b/golden/modules/byblameentry-sk/byblameentry-sk-demo.js
index 1d7d05c..d4ea6a7 100644
--- a/golden/modules/byblameentry-sk/byblameentry-sk-demo.js
+++ b/golden/modules/byblameentry-sk/byblameentry-sk-demo.js
@@ -1,7 +1,9 @@
 import './index.js'
 import '../gold-scaffold-sk'
 import { $$ } from 'common-sk/modules/dom'
-import { byBlameEntry, gitLog } from './test_data'
+import { byBlameEntry, fakeNow, gitLog } from './test_data'
+
+Date.now = () => fakeNow;
 
 const entry = document.createElement('byblameentry-sk');
 entry.byBlameEntry = byBlameEntry;
diff --git a/golden/modules/byblameentry-sk/test_data.js b/golden/modules/byblameentry-sk/test_data.js
index 7dfc6e6..0e06fcd 100644
--- a/golden/modules/byblameentry-sk/test_data.js
+++ b/golden/modules/byblameentry-sk/test_data.js
@@ -1,3 +1,5 @@
+export const fakeNow = Date.parse('2019-11-08T00:00:00Z');
+
 export const byBlameEntry = {
   "groupID": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa:bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb",
   "nDigests": 112,
@@ -32,7 +34,7 @@
     "sample_digest": "fed2ff29abe371fc0ec1b2c65dfb3949"
   }],
   "commits": [{
-    "commit_time": 1573149814,
+    "commit_time": 1573169814,
     "hash": "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb",
     "author": "Elisa (elisa@example.com)"
   }, {