on CompareGMs failure, show link to most recent results on this builder

slave/skia_slave_scripts/compare_gms.py

Index: slave/skia_slave_scripts/compare_gms.py
diff --git a/slave/skia_slave_scripts/compare_gms.py b/slave/skia_slave_scripts/compare_gms.py
index 90804deda6619e90ad1b15c608d7dffdce2b34eb..691bf12d3dd77ed7b23e974632fc67f7fc865184 100644
--- a/slave/skia_slave_scripts/compare_gms.py
+++ b/slave/skia_slave_scripts/compare_gms.py
@@ -13,6 +13,12 @@ from build_step import BuildStep, BuildStepWarning
 from utils import misc
 import run_gm
 
+LIVE_REBASELINE_SERVER_BASEURL = (
+    'http://skia-tree-status.appspot.com/redirect/rebaseline-server/'
+    'static/view.html#/view.html')
+# EPOGER: how can I share this definition with factory.py?
+LATEST_GM_FAILURES_PREAMBLE = 'View latest GM failures for this builder at: '
+
 class CompareGMs(BuildStep):
   def _Run(self):
     json_summary_path = misc.GetAbsPath(os.path.join(
@@ -24,7 +30,11 @@ class CompareGMs(BuildStep):
     # This import must happen after BuildStep.__init__ because it requires that
     # CWD is in PYTHONPATH, and BuildStep.__init__ may change the CWD.
     from gm import display_json_results
-    if not display_json_results.Display(json_summary_path):
+    success = display_json_results.Display(json_summary_path)
+    print '%s%s?resultsToLoad=/results/failures&builder=%s' % (
+        LATEST_GM_FAILURES_PREAMBLE, LIVE_REBASELINE_SERVER_BASEURL,
+        self._builder_name)
+    if not success:
       if self._builder_name in may_fail_with_warning:
         raise BuildStepWarning('Expectations mismatch in %s!' %
                                json_summary_path)