Ensure that SkDeferredCanvas::onCreateCompatibleDevice unrefs its temp device.

Also update my GM to use createCompatibleDevice.

Review URL: https://codereview.appspot.com/6357061

git-svn-id: http://skia.googlecode.com/svn/trunk@4450 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed