Add some basic presubmit checks
Add some basic presubmit checks

We will likely improve these over time, but these will at least help us make
sure patches get approved.

R=dpranke

Review URL: https://codereview.chromium.org/13561008

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@147530 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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