Added a progress indicater to sdk_update.py
Added a progress indicater to sdk_update.py

BUG=http://code.google.com/p/nativeclient-sdk/issues/detail?id=134
TEST=None

Review URL: http://codereview.chromium.org/8198015

git-svn-id: e22621a84199d42b34715cdc089545aeedbbf23f@1245 050acbb0-2703-11df-ab0a-9f3f633ae91d

sbc100/nativeclient-sdk,sbc100/nativeclient-sdk,sbc100/nativeclient-sdk,sbc100/nativeclient-sdk,sbc100/nativeclient-sdk,sbc100/nativeclient-sdk,sbc100/nativeclient-sdk