tryserver recipe_module: Add get_tags.

recipe_modules/depot_tools/api.py

Index: recipe_modules/depot_tools/api.py
diff --git a/recipe_modules/depot_tools/api.py b/recipe_modules/depot_tools/api.py
index 53b7a22432490a662aa812c748351f5d0eaf94bc..bbe98b324dda4a85375dfd5b3810871167ebd3a5 100644
--- a/recipe_modules/depot_tools/api.py
+++ b/recipe_modules/depot_tools/api.py
@@ -14,6 +14,10 @@ class DepotToolsApi(recipe_api.RecipeApi):
     return self.package_repo_resource('cros')
 
   @property
+  def git_cl_path(self):
+    return self.package_repo_resource('git_cl.py')
+
+  @property
   def gn_py_path(self):
     return self.package_repo_resource('gn.py')