Add a link to the perf dashboard in the test output.

mojo/tools/perf_test_runner.py

Index: mojo/tools/perf_test_runner.py
diff --git a/mojo/tools/perf_test_runner.py b/mojo/tools/perf_test_runner.py
index dff6b2d4596b921196d5ff6439aeac044bbad75a..ea3f34b06b2191fa023a1a44babf968b5608c39c 100755
--- a/mojo/tools/perf_test_runner.py
+++ b/mojo/tools/perf_test_runner.py
@@ -14,11 +14,6 @@ import subprocess
 import sys
 
 
-def _GetCurrentCommitCount():
-  return subprocess.check_output(
-      ["git", "rev-list", "HEAD", "--count"]).strip()
-
-
 def main():
   parser = argparse.ArgumentParser(
       description="A tool that runs a perf test and uploads the resulting data "
@@ -46,6 +41,9 @@ def main():
   parser.add_argument(
       "--perf-data-path",
       help="The path to the perf data that the perf test generates.")
+  parser.add_argument(
+      "--point-id", type=int,
+      help="The x coordinate for the data points.")
   server_group = parser.add_mutually_exclusive_group()
   server_group.add_argument(
       "--testing-dashboard", action="store_true", default=True,
@@ -63,19 +61,19 @@ def main():
      args.test_name is None or \
      args.builder_name is None or \
      args.build_number is None or \
-     args.perf_data_path is None:
+     args.perf_data_path is None or \
+     args.point_id is None:
     print "Won't upload perf data to the dashboard because not all of the " \
           "following values are specified: master-name, perf-id, test-name, " \
-          "builder-name, build-number, perf-data-path."
+          "builder-name, build-number, perf-data-path, point-id."
     return 0
 
   revision = Version().version
   perf_data = open(args.perf_data_path, "r")
-  point_id = _GetCurrentCommitCount()
 
   result = perf_data_uploader.UploadPerfData(
       args.master_name, args.perf_id, args.test_name, args.builder_name,
-      args.build_number, revision, perf_data, point_id, False,
+      args.build_number, revision, perf_data, args.point_id, False,
       args.testing_dashboard)
 
   return 0 if result else 1