Cache current V8 sheriff.

app.py

Index: app.py
diff --git a/app.py b/app.py
index b988164b4565728c2c9dd8d17e2f41dfb848447d..9c2a4f1ee1ec824d28b4eac48d297d5cee287352 100644
--- a/app.py
+++ b/app.py
@@ -532,6 +532,7 @@ def console_handler(unquoted_localpath, remoteurl, page_data=None):
     'sheriff_memory',
     'sheriff_nacl',
     'sheriff_perf',
+    'sheriff_v8',
     'sheriff_webkit',
   ]
   for sheriff_file in sheriff_files:
@@ -1081,6 +1082,11 @@ URLS = [
     'maxage': 15*60,  # 15 mins
   },
   {
+    'remoteurl': 'http://build.chromium.org/p/chromium/sheriff_v8.js',
+    'localpath': 'chromium/sheriff_v8.js',
+    'maxage': 15*60,  # 15 mins
+  },
+  {
     'remoteurl': 'http://build.chromium.org/p/chromium/sheriff_webkit.js',
     'localpath': 'chromium/sheriff_webkit.js',
     'maxage': 15*60,  # 15 mins