Adds uploading picture benchmark JSON data

slave/skia_slave_scripts/utils/sync_bucket_subdir.py

Index: slave/skia_slave_scripts/utils/sync_bucket_subdir.py
diff --git a/slave/skia_slave_scripts/utils/sync_bucket_subdir.py b/slave/skia_slave_scripts/utils/sync_bucket_subdir.py
index 01de8b6c98022c6f65135f914dd40849b944ae72..8c4052676f551057ce91638dc927961b53ad9e43 100755
--- a/slave/skia_slave_scripts/utils/sync_bucket_subdir.py
+++ b/slave/skia_slave_scripts/utils/sync_bucket_subdir.py
@@ -30,6 +30,7 @@ IGNORE_UPLOAD_FILENAMES = ('.DS_Store')
 
 def SyncBucketSubdir(directory, dest_gsbase=DEFAULT_PERFDATA_GS_BASE, subdir='',
     do_upload=True, do_download=True, filenames_filter=KNOWN_FILENAMES,
+    exclude_json=False,
     min_download_revision=0):
   """ synchronizes a local directory with a cloud one
 
@@ -85,6 +86,9 @@ def SyncBucketSubdir(directory, dest_gsbase=DEFAULT_PERFDATA_GS_BASE, subdir='',
         if not match:
           # Ignore other files, rather than raising an exception
           continue
+        # Ignore JSON files if the flag is set.
+        if exclude_json and file_name.endswith('.json'):
+          continue
         # Ignore force builds without a revision number.
         if match.group(1) != '':
           upload_to_bucket.upload_to_bucket(os.path.join(directory, file_name),