depot_tools: expose location of ninja

BUG=437264

Review URL: https://codereview.chromium.org/1787633003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@299263 0039d316-1c4b-4281-b951-d872f2087c98

recipe_modules/depot_tools/api.py

@@ -8,3 +8,7 @@ class DepotToolsApi(recipe_api.RecipeApi):
   @property
   def download_from_google_storage_path(self):
     return self.package_repo_resource('download_from_google_storage.py')
+
+  @property
+  def ninja_path(self):
+    return self.package_repo_resource('ninja')