remove xfermode from public api

BUG=skia:

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4020

CQ_INCLUDE_TRYBOTS=master.client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot

Change-Id: I19cd056f2af778f10e8c6c2b7b2735593b43dbac
Reviewed-on: https://skia-review.googlesource.com/4020
Reviewed-by: Florin Malita <fmalita@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/tools/debugger/SkDrawCommand.h b/tools/debugger/SkDrawCommand.h
index 8d30960..54ee3c6 100644
--- a/tools/debugger/SkDrawCommand.h
+++ b/tools/debugger/SkDrawCommand.h
@@ -643,7 +643,7 @@
 class SkDrawPatchCommand : public SkDrawCommand {
 public:
     SkDrawPatchCommand(const SkPoint cubics[12], const SkColor colors[4],
-                       const SkPoint texCoords[4], SkXfermode* xmode,
+                       const SkPoint texCoords[4], SkBlendMode bmode,
                        const SkPaint& paint);
     void execute(SkCanvas* canvas) const override;
     Json::Value toJSON(UrlDataManager& urlDataManager) const override;
@@ -655,7 +655,7 @@
     SkColor  fColors[4];
     SkPoint* fTexCoordsPtr;
     SkPoint  fTexCoords[4];
-    SkAutoTUnref<SkXfermode> fXfermode;
+    SkBlendMode fBlendMode;
     SkPaint fPaint;
 
     typedef SkDrawCommand INHERITED;
@@ -714,7 +714,7 @@
 public:
     SkDrawVerticesCommand(SkCanvas::VertexMode vmode, int vertexCount,
                           const SkPoint vertices[], const SkPoint texs[],
-                          const SkColor colors[], SkXfermode* xfermode,
+                          const SkColor colors[], SkBlendMode,
                           const uint16_t indices[], int indexCount,
                           const SkPaint& paint);
     virtual ~SkDrawVerticesCommand();
@@ -726,7 +726,7 @@
     SkPoint*    fVertices;
     SkPoint*    fTexs;
     SkColor*    fColors;
-    SkXfermode* fXfermode;
+    SkBlendMode fBlendMode;
     uint16_t*   fIndices;
     int         fIndexCount;
     SkPaint     fPaint;