Plumb iteration info

tools/perf/core/perf_benchmark.py

Index: tools/perf/core/perf_benchmark.py
diff --git a/tools/perf/core/perf_benchmark.py b/tools/perf/core/perf_benchmark.py
index 4158e2d23219bf17eea478976e9230368c9bec6d..9a9a9eeddd29d0c60bb9c95581b8a0891c75535f 100644
--- a/tools/perf/core/perf_benchmark.py
+++ b/tools/perf/core/perf_benchmark.py
@@ -24,6 +24,23 @@ class PerfBenchmark(benchmark.Benchmark):
     """ To be overridden by perf benchmarks. """
     pass
 
+  def GetExtraIterationInfo(self):
+    info = super(PerfBenchmark, self).GetExtraIterationInfo()
+
+    botName = os.environ.get('BUILDBOT_BUILDERNAME')
+    if botName:
+      info['botName'] = botName
+
+    buildNumber = os.environ.get('BUILDBOT_BUILDNUMBER')
+    if buildNumber:
+      info['buildNumber'] = buildNumber
+
+    revision = os.environ.get('BUILDBOT_REVISION')
+    if revision:
+      info['revision'] = revision
+
+    return info
+
   def CustomizeBrowserOptions(self, options):
     # Subclass of PerfBenchmark should override  SetExtraBrowserOptions to add
     # more browser options rather than overriding CustomizeBrowserOptions.