Add verbose flag to pnacl-compress.
Add verbose flag to pnacl-compress.

Modify pnacl-compress to run quietly unless the command line
flag --verbose is provided.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=3812
R=jvoung@chromium.org

Review URL: https://codereview.chromium.org/197873032

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@12896 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client