V8: Let peek-gn use mb to reuse v8-side configs.

scripts/slave/recipe_modules/chromium/api.py

Index: scripts/slave/recipe_modules/chromium/api.py
diff --git a/scripts/slave/recipe_modules/chromium/api.py b/scripts/slave/recipe_modules/chromium/api.py
index 8870c95734d03a42df0835dffb8883da586832bf..ea413cc92dd0046bcfebf615d881aea3da56d6d1 100644
--- a/scripts/slave/recipe_modules/chromium/api.py
+++ b/scripts/slave/recipe_modules/chromium/api.py
@@ -577,7 +577,7 @@ class ChromiumApi(recipe_api.RecipeApi):
   def run_mb(self, mastername, buildername, use_goma=True,
              mb_config_path=None, isolated_targets=None, name=None,
              build_dir=None, android_version_code=None,
-             android_version_name=None, gyp_script=None):
+             android_version_name=None, gyp_script=None, **kwargs_override):
     mb_config_path = (mb_config_path or
                       self.m.path['checkout'].join('tools', 'mb',
                                                    'mb_config.pyl'))
@@ -642,6 +642,7 @@ class ChromiumApi(recipe_api.RecipeApi):
       # Wrap 'runhooks' through 'cros chrome-sdk'
       kwargs['wrapper'] = self.get_cros_chrome_sdk_wrapper(clean=True)
 
+    kwargs.update(kwargs_override)

[Michael Achenbach, 2016/06/15 14:44:37]

Need this to pass ok_ret=any

[tandrii(chromium), 2016/06/15 15:25:37]

consider: s/kwargs/step_kwargs, and use normal **kwargs as func param. 

[Michael Achenbach, 2016/06/15 15:58:17]

Done.

     self.m.python(**kwargs)
 
     # Comes after self.m.python so the log appears in the correct step result.