Add manifest output to the bot_update api.

scripts/slave/recipe_modules/bot_update/test_api.py

Index: scripts/slave/recipe_modules/bot_update/test_api.py
diff --git a/scripts/slave/recipe_modules/bot_update/test_api.py b/scripts/slave/recipe_modules/bot_update/test_api.py
index 22ed4968ca4bd6e7046ea00778fbc8980d5d480c..cb2d81b85e8a79cfe48a16db398a3ec112d93786 100644
--- a/scripts/slave/recipe_modules/bot_update/test_api.py
+++ b/scripts/slave/recipe_modules/bot_update/test_api.py
@@ -11,7 +11,8 @@ from slave import recipe_test_api
 
 class BotUpdateTestApi(recipe_test_api.RecipeTestApi):
   def output_json(self, master, builder, slave, root, first_sln,
-                  revision_mapping, git_mode, force=False, fail_patch=False):
+                  revision_mapping, git_mode, force=False, fail_patch=False,
+                  output_manifest=False):
     """Deterministically synthesize json.output test data for gclient's
     --output-json option.
     """
@@ -41,6 +42,7 @@ class BotUpdateTestApi(recipe_test_api.RecipeTestApi):
             '%s_git' % property_name: self.gen_revision(project_name, True)
             for project_name, property_name in revision_mapping.iteritems()
         })
+
       output.update({
           'patch_root': root or first_sln,
           'root': first_sln,
@@ -48,6 +50,17 @@ class BotUpdateTestApi(recipe_test_api.RecipeTestApi):
           'step_text': 'Some step text'
       })
 
+      if output_manifest:
+        output.update({
+          'manifest': {
+            project_name: {
+              'repository': 'https://fake.org/%s.git' % project_name,
+              'revision': self.gen_revision(project_name, git_mode),
+            }
+            for project_name in revision_mapping
+          }
+        })
+
       if fail_patch:
         output['log_lines'] = [('patch error', 'Patch failed to apply'),]
         output['patch_failure'] = True