Switch GrMeshDrawOp::Target to be the stand alone GrMeshDrawTarget class

The Tessellator classes will survive in the NGA and they use
GrMeshDrawOp::Target - but GrMeshDrawOp will not survive.

This is a prelude to making all the remaining GrOp-derived classes OGA-only.

Bug: skia:11837
Change-Id: I62dc92e5f42d672342113f12dcedf3435fab993f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/419198
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
diff --git a/src/gpu/ops/GrAALinearizingConvexPathRenderer.cpp b/src/gpu/ops/GrAALinearizingConvexPathRenderer.cpp
index 780fa80..e19b57e 100644
--- a/src/gpu/ops/GrAALinearizingConvexPathRenderer.cpp
+++ b/src/gpu/ops/GrAALinearizingConvexPathRenderer.cpp
@@ -221,7 +221,7 @@
                                                             renderPassXferBarriers, colorLoadOp);
     }
 
-    void recordDraw(Target* target,
+    void recordDraw(GrMeshDrawTarget* target,
                     int vertexCount, size_t vertexStride, void* vertices,
                     int indexCount, uint16_t* indices) {
         if (vertexCount == 0 || indexCount == 0) {
@@ -251,7 +251,7 @@
         fMeshes.push_back(mesh);
     }
 
-    void onPrepareDraws(Target* target) override {
+    void onPrepareDraws(GrMeshDrawTarget* target) override {
         if (!fProgramInfo) {
             this->createProgramInfo(target);
             if (!fProgramInfo) {