Try out SkMatrix::Concat.

src/record/SkRecordDraw.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkRecordDraw.h"
 
 void SkRecordDraw(const SkRecord& record, SkCanvas* canvas) {
@@ skipping 20 matching lines @@
 template <> void Draw::draw(const NoOp&) {}
 
 #define DRAW(T, call) template <> void Draw::draw(const T& r) { fCanvas->call; }
 DRAW(Restore, restore());
 DRAW(Save, save(r.flags));
 DRAW(SaveLayer, saveLayer(r.bounds, r.paint, r.flags));
 DRAW(PopCull, popCull());
 DRAW(PushCull, pushCull(r.rect));
 DRAW(Clear, clear(r.color));
 DRAW(Concat, concat(r.matrix));
-
-// We can't clobber the canvas' initial CTM when calling setMatrix.
-template <> void Draw::draw(const SetMatrix& r) {
-    SkMatrix ctm;
-    ctm.setConcat(fInitialCTM, r.matrix);
-    fCanvas->setMatrix(ctm);
-}
+DRAW(SetMatrix, setMatrix(SkMatrix::Concat(fInitialCTM, r.matrix)));
 
 DRAW(ClipPath, clipPath(r.path, r.op, r.doAA));
 DRAW(ClipRRect, clipRRect(r.rrect, r.op, r.doAA));
 DRAW(ClipRect, clipRect(r.rect, r.op, r.doAA));
 DRAW(ClipRegion, clipRegion(r.region, r.op));
 
 DRAW(DrawBitmap, drawBitmap(r.bitmap, r.left, r.top, r.paint));
 DRAW(DrawBitmapMatrix, drawBitmapMatrix(r.bitmap, r.matrix, r.paint));
 DRAW(DrawBitmapNine, drawBitmapNine(r.bitmap, r.center, r.dst, r.paint));
 DRAW(DrawBitmapRectToRect, drawBitmapRectToRect(r.bitmap, r.src, r.dst, r.paint, r.flags));
@@ skipping 10 matching lines @@
 DRAW(DrawText, drawText(r.text, r.byteLength, r.x, r.y, r.paint));
 DRAW(DrawTextOnPath, drawTextOnPath(r.text, r.byteLength, r.path, r.matrix, r.paint));
 DRAW(DrawVertices, drawVertices(r.vmode, r.vertexCount, r.vertices, r.texs, r.colors,
                                 r.xmode.get(), r.indices, r.indexCount, r.paint));
 #undef DRAW
 
 template <> void Draw::draw(const PairedPushCull& r) { this->draw(*r.base); }
 template <> void Draw::draw(const BoundedDrawPosTextH& r) { this->draw(*r.base); }
 
 }  // namespace SkRecords