It needs to be parsed manually and assumes '=*' for property that do not specify
a value.

Add clearer message on failure like that by specifiying the command line.

R=dpranke@chromium.org
BUG=
TEST=

Review URL: http://codereview.chromium.org/7085022

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@87255 0039d316-1c4b-4281-b951-d872f2087c98