GitLab

Add a new method to SkLayerRasterizer::Builder that creates a new
SkLayerRasterizer without destroying the Builder. Necessary to
continue to support Android's API.

Also fix a bug where creating a Builder and never calling
detachRasterizer results in not calling the destructor for any SkPaints
in the Builder.

Add tests.

BUG=b/13729784
R=reed@google.com, dominikg@chromium.org

Author: scroggo@google.com

Review URL: https://codereview.chromium.org/233673002

git-svn-id: http://skia.googlecode.com/svn/trunk@14139 2bbb7eff-a529-9590-31e7-b0007b416f81