Archive release benchmark data in separate folder

Change-Id: I0ff75487590917c6dc80d11ca9c528203ee41773
diff --git a/tools/utils.py b/tools/utils.py
index 66f8e36..1e26ee9 100644
--- a/tools/utils.py
+++ b/tools/utils.py
@@ -17,6 +17,7 @@
 import zipfile
 
 import defines
+import historic_run
 from thread_utils import print_thread
 
 ANDROID_JAR_DIR = 'third_party/android_jar/lib-v{api}'
@@ -385,6 +386,10 @@
     return result.strip()
 
 
+def get_HEAD_commit():
+    return historic_run.git_commit_from_hash(get_HEAD_sha1())
+
+
 def get_HEAD_sha1():
     return get_sha1_from_revision('HEAD')