Added the framework for having canvas/recorder/picture record depth_set's.

src/core/SkPictureRecord.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkPictureRecord_DEFINED
 #define SkPictureRecord_DEFINED
 
@@ skipping 141 matching lines @@
     sk_sp<SkSurface> onNewSurface(const SkImageInfo&, const SkSurfaceProps&) override;
     bool onPeekPixels(SkPixmap*) override { return false; }
 
     void willSave() override;
     SaveLayerStrategy getSaveLayerStrategy(const SaveLayerRec&) override;
     void willRestore() override;
 
     void didConcat(const SkMatrix&) override;
     void didSetMatrix(const SkMatrix&) override;
 
+    void didTranslateZ(SkScalar) override;
+
     void onDrawDRRect(const SkRRect&, const SkRRect&, const SkPaint&) override;
 
     void onDrawText(const void* text, size_t, SkScalar x, SkScalar y, const SkPaint&) override;
     void onDrawPosText(const void* text, size_t, const SkPoint pos[], const SkPaint&) override;
     void onDrawPosTextH(const void* text, size_t, const SkScalar xpos[], SkScalar constY,
                         const SkPaint&) override;
     void onDrawTextOnPath(const void* text, size_t byteLength, const SkPath& path,
                                   const SkMatrix* matrix, const SkPaint&) override;
     void onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y,
                                 const SkPaint& paint) override;
@@ skipping 72 matching lines @@
 
     uint32_t fRecordFlags;
     int      fInitialSaveCount;
 
     friend class SkPictureData;   // for SkPictureData's SkPictureRecord-based constructor
 
     typedef SkCanvas INHERITED;
 };
 
 #endif