Make gyp target_arch setting native to chromium/config.py

scripts/slave/recipe_modules/v8/chromium_config.py

Index: scripts/slave/recipe_modules/v8/chromium_config.py
diff --git a/scripts/slave/recipe_modules/v8/chromium_config.py b/scripts/slave/recipe_modules/v8/chromium_config.py
index f7d48e097d956be7ee3e856ae3bc59d4abe5e8da..e5cb4d64e191454bbfa33b8f178b0c3db61316c2 100644
--- a/scripts/slave/recipe_modules/v8/chromium_config.py
+++ b/scripts/slave/recipe_modules/v8/chromium_config.py
@@ -1,18 +1,18 @@
+# Copyright 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
 from slave.recipe_config_types import Path
+from slave import recipe_config
 from RECIPE_MODULES.chromium import CONFIG_CTX
 
 
 @CONFIG_CTX()
 def v8(c):
-  if c.TARGET_ARCH == 'arm':
-    v8_target_arch = 'arm'
-  elif c.TARGET_ARCH == 'mips':
-    v8_target_arch = 'mips'
-  elif c.TARGET_BITS == 64:
-    v8_target_arch = 'x64'
-  else:
-    v8_target_arch = 'ia32'
-  c.gyp_env.GYP_DEFINES['v8_target_arch'] = v8_target_arch
+  targ_arch = c.gyp_env.GYP_DEFINES.get('target_arch')
+  if not targ_arch:  # pragma: no cover
+    raise recipe_config.BadConf('v8 must have a valid target_arch.')
+  c.gyp_env.GYP_DEFINES['v8_target_arch'] = targ_arch
   del c.gyp_env.GYP_DEFINES['component']
   c.build_config_fs = c.BUILD_CONFIG
   c.build_dir = Path('[CHECKOUT]')