Move SkRWBuffer.h to include/ and add SK_API

Move SkRWBuffer.h to include/ and add SK_API

Needed for use in Blink in crrev.com/1812273003
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1838463003

Committed: https://skia.googlesource.com/skia/+/77899d122083644380c833a32bd4ab5212cb0ec2

[scroggo_chromium, 2016-03-25 18:26:45]

Description was changed from

==========
Move SkRWBuffer.h to include/ and add SK_API

Needed for use in Blink in crrev.com/1812273003
==========

to

==========
Move SkRWBuffer.h to include/ and add SK_API

Needed for use in Blink in crrev.com/1812273003
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

[scroggo_chromium, 2016-03-25 18:27:40]

scroggo@chromium.org changed reviewers:
+ djsollen@google.com

[djsollen, 2016-03-25 18:38:32]

api lgtm

[scroggo, 2016-03-25 18:39:58]

The CQ bit was checked by scroggo@google.com

[commit-bot: I haz the power, 2016-03-25 18:40:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1838463003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1838463003/1

[commit-bot: I haz the power, 2016-03-25 19:00:17]

Description was changed from

==========
Move SkRWBuffer.h to include/ and add SK_API

Needed for use in Blink in crrev.com/1812273003
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

to

==========
Move SkRWBuffer.h to include/ and add SK_API

Needed for use in Blink in crrev.com/1812273003
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...

Committed:
https://skia.googlesource.com/skia/+/77899d122083644380c833a32bd4ab5212cb0ec2
==========

[commit-bot: I haz the power, 2016-03-25 19:00:19]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/77899d122083644380c833a32bd4ab5212cb0ec2