GitLab

Add -W to SHPINXOPTS to make warnings into error.

Add presubmit check that makes sure sphinx is happy
with the content.

Use 2 spaces to indent code.

Add a missing document.

Fix document links in examples.rst.

Use 'out' for build product data to be constent with
chrome and native_client.

Add 'all' target so that 'make' on its own will work
(I'm lazy)

R=binji@chromium.org, eliben@chromium.org

Review URL: https://codereview.chromium.org/23531031

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@221806 0039d316-1c4b-4281-b951-d872f2087c98