Always disable the scissor test before BlitFrameBuffer

It seems most (all?) implementations of BlitFrameBuffer actually
obey the scissor test, so just always disable the scissor before
calling BlitFrameBuffer.

Original Author: Henry Song <henrysong@samsung.com>

R=bsalomon@google.com, hcm@google.com

Author: derekf@osg.samsung.com

Review URL: https://codereview.chromium.org/574543002
diff --git a/AUTHORS b/AUTHORS
index 2565a66..c8827a5 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -23,6 +23,7 @@
 NVIDIA <*@nvidia.com>
 Opera Software ASA <*@opera.com>
 Samsung <*@samsung.com>
+Samsung Open Source Group <*@osg.samsung.com>
 Skia <*@skia.org>
 Skia Buildbots <skia.buildbots@gmail.com>
 Steve Singer <steve@ssinger.info>