Increase the timeout for the perf buildbots.

masters/master.chromium.chrome/master.cfg

Index: masters/master.chromium.chrome/master.cfg
diff --git a/masters/master.chromium.chrome/master.cfg b/masters/master.chromium.chrome/master.cfg
index 716137348a8e4b73ce3843a5aa92f04ad6f2e3b9..65b0a2140e4f7b3cb1a0fac14e74c63a37a24fa4 100644
--- a/masters/master.chromium.chrome/master.cfg
+++ b/masters/master.chromium.chrome/master.cfg
@@ -94,7 +94,7 @@ b_google_chrome_rel_linux = {
 b_google_chrome_rel_linux_64 = {
   'name': 'Google Chrome Linux x64',
   'builddir': 'google-chrome-rel-linux_64',
-  'factory': m_annotator.BaseFactory('chromium', timeout=3600),
+  'factory': m_annotator.BaseFactory('chromium', timeout=4800),

[Alexander Potapenko, 2015/12/15 17:40:13]

I'm guessing this is a temporary solution. Can you please link the crbug here,
so that the timeout can be reverted when the bug is fixed?

[krasin, 2015/12/15 17:49:56]

Done.

   'notify_on_missing': True,
 }