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

src/core/SkPicturePlayback.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 "SkCanvas.h"
 #include "SkPatchUtils.h"
 #include "SkPictureData.h"
@@ skipping 111 matching lines @@
                                  DrawType op,
                                  uint32_t size,
                                  SkCanvas* canvas,
                                  const SkMatrix& initialMatrix) {
     switch (op) {
         case NOOP: {
             SkASSERT(size >= 4);
             reader->skip(size - 4);
         } break;
         case CLIP_PATH: {
-            const SkPath& path = fPictureData->getPath(reader);
-            uint32_t packed = reader->readInt();
+            const SkPath& path = fPictureData->getPath(reader); 
+            uint32_t packed = reader->readInt(); 
             SkRegion::Op regionOp = ClipParams_unpackRegionOp(packed);
             bool doAA = ClipParams_unpackDoAA(packed);
             size_t offsetToRestore = reader->readInt();
             SkASSERT(!offsetToRestore || offsetToRestore >= reader->offset());
             canvas->clipPath(path, regionOp, doAA);
             if (canvas->isClipEmpty() && offsetToRestore) {
                 reader->skip(offsetToRestore - reader->offset());
             }
         } break;
         case CLIP_REGION: {
@@ skipping 452 matching lines @@
         case SKEW: {
             SkScalar sx = reader->readScalar();
             SkScalar sy = reader->readScalar();
             canvas->skew(sx, sy);
         } break;
         case TRANSLATE: {
             SkScalar dx = reader->readScalar();
             SkScalar dy = reader->readScalar();
             canvas->translate(dx, dy);
         } break;
+        case TRANSLATE_Z: {
+            SkScalar dz = reader->readScalar();
+            canvas->translateZ(dz);
+        }
         default:
             SkASSERTF(false, "Unknown draw type: %d", op);
     }
 }