Add CIPD GAE SDK recipe module and packager.

scripts/slave/recipe_modules/zip/api.py

Index: scripts/slave/recipe_modules/zip/api.py
diff --git a/scripts/slave/recipe_modules/zip/api.py b/scripts/slave/recipe_modules/zip/api.py
index 0d915173c4153c7c3494e35d01c9c2f875017bfb..bee9d8fe8b169a0f3405995193a74a649aba3017 100644
--- a/scripts/slave/recipe_modules/zip/api.py
+++ b/scripts/slave/recipe_modules/zip/api.py
@@ -41,7 +41,7 @@ class ZipApi(recipe_api.RecipeApi):
     pkg.add_directory(directory)
     pkg.zip(step_name)
 
-  def unzip(self, step_name, zip_file, output):
+  def unzip(self, step_name, zip_file, output, quiet=False):
     """Step to uncompress |zip_file| into |output| directory.
 
     Zip package will be unpacked to |output| so that root of an archive is in
@@ -53,12 +53,16 @@ class ZipApi(recipe_api.RecipeApi):
       step_name: display name of a step.
       zip_file: path to a zip file to uncompress, should exist.
       output: path to a directory to unpack to, it should NOT exist.
+      quiet (bool): If True, print terse output instead of the name
+          of each unzipped file.
     """
     # TODO(vadimsh): Use 7zip on Windows if available?
     script_input = {
       'output': str(output),
       'zip_file': str(zip_file),
     }
+    if quiet:
+      script_input['quiet'] = True
     self.m.python(
         name=step_name,
         script=self.resource('unzip.py'),