Fix AA outset in GrAAFillRRectOp lower left corner

Octagon vertices should bloat for AA in both axes. One of the lower
left vertices was not doing this.

Bug: skia:
Change-Id: Ie7aad285244529425eb9c3dca9ff1acbb2848218
Reviewed-on: https://skia-review.googlesource.com/c/172985
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
diff --git a/src/gpu/ops/GrAAFillRRectOp.cpp b/src/gpu/ops/GrAAFillRRectOp.cpp
index 1b24fc0..ed7f9cf 100644
--- a/src/gpu/ops/GrAAFillRRectOp.cpp
+++ b/src/gpu/ops/GrAAFillRRectOp.cpp
@@ -205,7 +205,7 @@
         {{{0,0,0,1}},  {{-1,+1}},  {{+1, 0}},  {{ 0,-1}},  1,  0},
         {{{0,0,0,1}},  {{-1,+1}},  {{ 0,-1}},  {{+1, 0}},  1,  0},
         {{{0,0,0,1}},  {{-1,+1}},  {{ 0,-1}},  {{-1, 0}},  0,  0},
-        {{{0,0,0,1}},  {{-1,+1}},  {{0,-kOctoOffset}},  {{-1, 0}},  0,  0},
+        {{{0,0,0,1}},  {{-1,+1}},  {{0,-kOctoOffset}},  {{-1,+1}},  0,  0},
         {{{0,0,0,1}},  {{-1,+1}},  {{+kOctoOffset,0}},  {{-1,+1}},  0,  0}};
 
 GR_DECLARE_STATIC_UNIQUE_KEY(gVertexBufferKey);