Roll swarming_client @ 9cc42c3d4d.

This requires small changes in build/isolate.gypi, the isolate.py --variable
flag was split in three.

$ git log aab3a62beb..9cc42c3d4d --date=short --format="%ad %ae %s" | sed 's/@chromium\.org//'
2013-12-11 maruel Ensure variables are decoded to unicode.
2013-12-06 maruel Rename --command-variable to --extra-variables.
2013-12-06 maruel Add real variable support and split --variable in 3 different flags.
2013-12-05 vadimsh Add 'offset' parameter to StorageApi.fetch(...) method.
2013-12-05 maruel Change log message to be clearer.
2013-12-05 vadimsh Support custom HTTP headers in net.url_open.
2013-12-03 vadimsh Remove urllib2 support.
2013-12-03 vadimsh Wait for Storage's internal threads to finish before exiting.
2013-12-03 vadimsh Fix swarming_smoke_test.py and isolateserver_test.py.

R=vadimsh@chromium.org
BUG=324911

Review URL: https://codereview.chromium.org/105933002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240155 0039d316-1c4b-4281-b951-d872f2087c98
cros: Use ProfileHelper::GetSigninProfile for StubLogin.

BUG=322682

Review URL: https://codereview.chromium.org/112193003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240156 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240157 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 240157