Force 'target_arch=ia32' on all Valgrind bots on the memory watefall, introduce valgrind_cros_gyp_defines to simplify the CrOS Valgrind bots config. Review URL: http://codereview.chromium.org/7035009
Force 'target_arch=ia32' on all Valgrind bots on the memory watefall,
introduce valgrind_cros_gyp_defines to simplify the CrOS Valgrind bots config.
Review URL: http://codereview.chromium.org/7035009

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@85607 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build