There are only a handful of SkFlattenables that are not flattenable. That
there are any seems highly illogical. To make this look less like a normal
thing, this removes both macros that marked SkFlattenables as non-flattenable
(in slightly different ways).
The handful of SkFlattenables in our codebase that can't be flattened now
assert violently that they can't be flattened. They're internal or
part of animator... places where we'll never actually flatten them.
TestLooper and DummyRasterizer were so trivial that I just made them flattenable.
BUG=skia:
Review URL: https://codereview.chromium.org/841753002
In SkLayerRasterizer::snapshotRasterizer() and ::detachRasterizer(),
if no layers have been added, do not attempt to create an
SkLayerRasterizer. Instead, return NULL.
This fixes an error when running tests on Android.
Update dox to state that NULL may be returned.
Add tests.
R=reed@google.com
Author: scroggo@google.com
Review URL: https://codereview.chromium.org/313653006
