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When there is more than 1 core in the system, request extra temp files
and use LLC's StreamInitWithSplit rpc to enable module splitting.
If the RPC fails, fall back to StreamInitWithOverrides.

Add a private Pepper interface to get the cpu count rather than
duplicating base::SysInfo in the plugin.

TEST=browser_tests --gtest_filter=NaClBrowserTstPnacl.*
BUG= https://code.google.com/p/nativeclient/issues/detail?id=3777
R=jschuh@chromium.org, jvoung@chromium.org, teravest@chromium.org

Review URL: https://codereview.chromium.org/165433003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251458 0039d316-1c4b-4281-b951-d872f2087c98