[CT] Use zips of SKPs to speed up "isolate tests"

content/test/ct/run_ct_skps.py

Index: content/test/ct/run_ct_skps.py
diff --git a/content/test/ct/run_ct_skps.py b/content/test/ct/run_ct_skps.py
index 10c5a31b03ba3db82b8d0d28c60bdb175a654d40..dd4ef9f7b63a2bb9cdc7440f5332befaab94b538 100755
--- a/content/test/ct/run_ct_skps.py
+++ b/content/test/ct/run_ct_skps.py
@@ -9,6 +9,7 @@ import argparse
 import os
 import subprocess
 import sys
+import zipfile
 
 
 PARENT_DIR = os.path.dirname(os.path.realpath(__file__))
@@ -35,8 +36,15 @@ def main():
                            'isolateserver all artifacts in this dir.')
   args = parser.parse_args()
 
-  tool_path = os.path.join(SKIA_SRC_DIR, 'out', args.configuration, args.tool)
+  # Unzip SKPs into a directory.
+  skps_zip = os.path.join(REPOS_BASE_DIR, 'skps',
+                          'slave%d.zip' % args.slave_num)
   skps_dir = os.path.join(REPOS_BASE_DIR, 'skps', 'slave%d' % args.slave_num)
+  os.makedirs(skps_dir)
+  with zipfile.ZipFile(skps_zip, 'r') as zip_ref:
+    zip_ref.extractall(skps_dir)
+
+  tool_path = os.path.join(SKIA_SRC_DIR, 'out', args.configuration, args.tool)
   resource_path = os.path.join(SKIA_SRC_DIR, 'resources')
 
   cmd = [tool_path]