Use SkLayerDrawLooper::Builder to construct SkLayerDrawLooper.

The addLayer() methods of SkLayerDrawLooper will soon be removed. This CL
updates all uses of those methods with the corresponding methods in
SkLayerDrawLooper::Builder.

BUG=skia:2141

Review URL: https://codereview.chromium.org/177473003

git-svn-id: svn://svn.chromium.org/blink/trunk@168041 bbb929c8-8fbe-4397-9dbb-9b2b20218538