Add a --skip-gradle-build to the archive script

This can make faster turnaround when testing the archive script locally.

Change-Id: I7061ca49f62f58b437f6067f202801eaa3a477d3
diff --git a/tools/create_maven_release.py b/tools/create_maven_release.py
index 33e6f75..472bd96 100755
--- a/tools/create_maven_release.py
+++ b/tools/create_maven_release.py
@@ -309,12 +309,13 @@
     base_no_zip = out[0:len(out)-4]
     make_archive(base_no_zip, 'zip', tmp_dir)
 
-def generate_r8_maven_zip(out, is_r8lib=False, version_file=None):
+def generate_r8_maven_zip(out, is_r8lib=False, version_file=None, skip_gradle_build=False):
   # Build the R8 no deps artifact.
-  if not is_r8lib:
-    gradle.RunGradleExcludeDeps([utils.R8])
-  else:
-    gradle.RunGradle([utils.R8LIB, '-Pno_internal'])
+  if not skip_gradle_build:
+    if not is_r8lib:
+      gradle.RunGradleExcludeDeps([utils.R8])
+    else:
+      gradle.RunGradle([utils.R8LIB, '-Pno_internal'])
 
   version = determine_version()
   with utils.TempDir() as tmp_dir: