Add new site isolation trybot.

scripts/slave/recipes/chromium_trybot.py

Index: scripts/slave/recipes/chromium_trybot.py
diff --git a/scripts/slave/recipes/chromium_trybot.py b/scripts/slave/recipes/chromium_trybot.py
index c83bbabf526de527aa92a638b915ef9b464b297d..009f127a6d7cbbc0b22f8761d555696031a00ef0 100644
--- a/scripts/slave/recipes/chromium_trybot.py
+++ b/scripts/slave/recipes/chromium_trybot.py
@@ -233,6 +233,16 @@ BUILDERS = freeze({
           'platform': 'linux',
         },
       },
+      'linux_site_isolation': {
+        'based_on_main_waterfall': {
+          'mastername': 'chromium.fyi',
+          'buildername': 'Site Isolation Linux',
+          'tester': 'Site Isolation Linux',

[hinoka, 2015/02/21 01:29:11]

I don't think you need this.  I think this is just for builder/tester split
configs (ie, if the compiler and tester are on different builders).

[alexmos, 2015/02/21 01:52:57]

Done.

+        },
+        'testing': {
+          'platform': 'linux',
+        },
+      },
       'linux_chromium_practice_rel_ng': {
         'based_on_main_waterfall': {
           'mastername': 'chromium.fyi',