V8: Explicitly define presence of valgrind on relevant builder

scripts/slave/recipe_modules/v8/chromium_config.py

 # 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 recipe_engine.config import BadConf
 from recipe_engine.config_types import Path
 from recipe_engine import config as recipe_config
 
 import DEPS
 CONFIG_CTX = DEPS['chromium'].CONFIG_CTX
@@ skipping 74 matching lines @@
 def enable_slow_dchecks(c):
   c.gyp_env.GYP_DEFINES['v8_enable_slow_dchecks'] = 1  # pragma: no cover
 
 
 @CONFIG_CTX(includes=['v8'])
 def gcmole(c):
   c.gyp_env.GYP_DEFINES['gcmole'] = 1
 
 
 @CONFIG_CTX(includes=['v8'])
+def has_valgrind(c):
+  c.gyp_env.GYP_DEFINES['has_valgrind'] = 1
+
+
+@CONFIG_CTX(includes=['v8'])
 def coverage(c):
   c.gyp_env.GYP_DEFINES['coverage'] = 1
 
 
 @CONFIG_CTX(includes=['v8'])
 def internal_snapshot(c):
   c.gyp_env.GYP_DEFINES['v8_use_external_startup_data'] = 0
 
 
 @CONFIG_CTX(includes=['v8'])
@@ skipping 109 matching lines @@
 def vtunejit(c):
   c.gyp_env.GYP_DEFINES['v8_enable_vtunejit'] = 1
 
 
 @CONFIG_CTX(includes=['v8'])
 def x87(c):
   # TODO(machenbach): Chromium does not support x87 yet. With the current
   # configuration, target_arch can't be set through a parameter as ARCH=intel
   # and BITS=32 is ambigue with x87.
   c.gyp_env.GYP_DEFINES['v8_target_arch'] = 'x87'