Update linux/moz to use new perf format.

tools/perf_expectations/tests/perf_expectations_unittest.py

Index: tools/perf_expectations/tests/perf_expectations_unittest.py
diff --git a/tools/perf_expectations/tests/perf_expectations_unittest.py b/tools/perf_expectations/tests/perf_expectations_unittest.py
index 88b8251209458d71083d971f5f87fa33d0990469..ffb0e2314e217443f9237a05e7a8fc71525004fb 100755
--- a/tools/perf_expectations/tests/perf_expectations_unittest.py
+++ b/tools/perf_expectations/tests/perf_expectations_unittest.py
@@ -105,14 +105,28 @@ class PerfExpectationsUnittest(unittest.TestCase):
     for key in perf_data:
       if key == 'load':
         continue
-      if 'delta' not in perf_data[key] or 'var' not in perf_data[key]:
-        bad_keys.append(key)
-      if (not isinstance(perf_data[key]['delta'], int) and
-          not isinstance(perf_data[key]['delta'], float)):
-        bad_keys.append(key)
-      if (not isinstance(perf_data[key]['var'], int) and
-          not isinstance(perf_data[key]['var'], float)):
-        bad_keys.append(key)
+
+      # First check if regress/improve is in the key's data.
+      if 'regress' in perf_data[key]:
+        if 'improve' not in perf_data[key]:
+          bad_keys.append(key)
+        if (not isinstance(perf_data[key]['regress'], int) and
+            not isinstance(perf_data[key]['regress'], float)):
+          bad_keys.append(key)
+        if (not isinstance(perf_data[key]['improve'], int) and
+            not isinstance(perf_data[key]['improve'], float)):
+          bad_keys.append(key)
+      else:
+        # Otherwise check if delta/var is in the key's data.
+        if 'delta' not in perf_data[key] or 'var' not in perf_data[key]:
+          bad_keys.append(key)
+        if (not isinstance(perf_data[key]['delta'], int) and
+            not isinstance(perf_data[key]['delta'], float)):
+          bad_keys.append(key)
+        if (not isinstance(perf_data[key]['var'], int) and
+            not isinstance(perf_data[key]['var'], float)):
+          bad_keys.append(key)
+
     if len(bad_keys) > 0:
       msg = "perf expectations key values missing or invalid delta/var"
       raise Exception("%s: %s" % (msg, bad_keys))