remove use of initial matrix

This was just wrong. It should be determine perspective
using the matrix that we are drawing with, and not the initial
matrix.

Change-Id: I8410ced714d2c766305656bdbd797f9dea59b71e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/339796
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Herb Derby <herb@google.com>
diff --git a/src/gpu/ops/GrAtlasTextOp.cpp b/src/gpu/ops/GrAtlasTextOp.cpp
index e868604..88a328b 100644
--- a/src/gpu/ops/GrAtlasTextOp.cpp
+++ b/src/gpu/ops/GrAtlasTextOp.cpp
@@ -236,7 +236,7 @@
 
     for (const Geometry& geo : fGeometries.items()) {
         const GrAtlasSubRun& subRun = geo.fSubRun;
-        SkASSERT((int)subRun.vertexStride() == vertexStride);
+        SkASSERT((int) subRun.vertexStride(geo.fDrawMatrix) == vertexStride);
 
         const int subRunEnd = subRun.glyphCount();
         for (int subRunCursor = 0; subRunCursor < subRunEnd;) {