Fix for empty saveLayer() with a filter which affects transparent black.

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 71 matching lines @@
         return fWriter;
     }
 
     void beginRecording();
     void endRecording();
 
     void internalOnly_EnableOpts(bool optsEnabled) {
         fOptsEnabled = optsEnabled;
     }
 
+protected:
+    void addNoOp();
+
 private:
     void handleOptimization(int opt);
     size_t recordRestoreOffsetPlaceholder(SkRegion::Op);
     void fillRestoreOffsetPlaceholdersForCurrentStackLevel(uint32_t restoreOffset);
 
 #ifndef SK_COLLAPSE_MATRIX_CLIP_STATE
     SkTDArray<int32_t> fRestoreOffsetStack;
     int fFirstSavedLayerIndex;
     enum {
         kNoSavedLayerIndex = -1
@@ skipping 200 matching lines @@
     friend class SkPictureTester; // for unit testing
 
 #ifdef SK_COLLAPSE_MATRIX_CLIP_STATE
     SkMatrixClipStateMgr fMCMgr;
 #endif
 
     typedef SkCanvas INHERITED;
 };
 
 #endif