Don't forget to call putBackVertices from the stroke tessellator

Change-Id: I80652861841ec4f049336f1759c1c26a934c309a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/369261
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>

src/gpu/tessellate/GrStrokeHardwareTessellator.cpp

@@ -169,6 +169,9 @@ void GrStrokeHardwareTessellator::prepare(GrMeshDrawOp::Target* target, const Sk
         }
     }
 
+    fTarget->putBackVertices(fCurrChunkPatchCapacity - fPatchChunks.back().fPatchCount,
+                             GrStrokeTessellateShader::kTessellationPatchBaseStride);
+
     fTarget = nullptr;
     fViewMatrix = nullptr;
 }