Fix key in perf data

Bug: skia:
Change-Id: Ic65f6dd37b2fa16989e4c2f780672e3293ddbd5f
Reviewed-on: https://skia-review.googlesource.com/c/160762
Reviewed-by: Kevin Lubick <kjlubick@google.com>
diff --git a/infra/bots/buildstats_web.py b/infra/bots/buildstats_web.py
index 1dfd898..bdee07c 100644
--- a/infra/bots/buildstats_web.py
+++ b/infra/bots/buildstats_web.py
@@ -19,7 +19,7 @@
   propstr = sys.argv[4]
 
   results = {
-    'keys': { },
+    'key': { },
     'results': { }
   }
 
@@ -29,7 +29,7 @@
 
   keys = keystr.split(' ')
   for i in range(0, len(keys), 2):
-    results['keys'][keys[i]] = keys[i+1]
+    results['key'][keys[i]] = keys[i+1]
 
   r = {
     'total_size_bytes': os.path.getsize(input_file)