Remove macros that make it look like it's a good idea to not be able to flatten.

Remove macros that make it look like it's a good idea to not be able to flatten.

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:

Committed: https://skia.googlesource.com/skia/+/7e44bb191633e225fd0455c267dbf67f9ee8633e

[mtklein, 2015-01-07 16:15:27]

mtklein@google.com changed reviewers:
+ mtklein@google.com, reed@google.com

[reed1, 2015-01-07 16:20:27]

no callers in chrome?

lgtm

[mtklein, 2015-01-07 16:55:56]

On 2015/01/07 16:20:27, reed1 wrote:
> no callers in chrome?
> 
> lgtm

None I can find.

[mtklein, 2015-01-07 16:55:59]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2015-01-07 16:56:23]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/841753002/20001

[commit-bot: I haz the power, 2015-01-07 17:06:11]

Committed patchset #2 (id:20001) as
https://skia.googlesource.com/skia/+/7e44bb191633e225fd0455c267dbf67f9ee8633e