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If the Runner wasn't actually told to Start(), the DelegateSimpleThread would
DCHECK for not having been Started. This patch makes it so we don't allocate
a DST unless we need to.

Also adds basic unittest files for DynamicServiceLoader and Runner.

BUG=

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=285650

Review URL: https://codereview.chromium.org/414173004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285849 0039d316-1c4b-4281-b951-d872f2087c98