Refactor SkPicturePlayback for SkPictureReplacementPlayback

src/core/SkPicturePlayback.h

Index: src/core/SkPicturePlayback.h
diff --git a/src/core/SkPicturePlayback.h b/src/core/SkPicturePlayback.h
index 4248e2de5c4db2a2c14312b6035fc0e6f3e3abf3..a785bd0501d6253af284515c75226b0f73c1e141 100644
--- a/src/core/SkPicturePlayback.h
+++ b/src/core/SkPicturePlayback.h
@@ -9,6 +9,7 @@
 #define SkPicturePlayback_DEFINED
 
 #include "SkPictureFlat.h"  // for DrawType
+#include "SkPictureStateTree.h"
 
 class SkBitmap;
 class SkCanvas;
@@ -74,11 +75,11 @@ public:
         SkTDArray<ReplacementInfo> fReplacements;
     };
 
-    // Replace all the draw ops in the replacement ranges in 'replacements' with
-    // the associated drawBitmap call
-    // Draw replacing cannot be enabled at the same time as draw limiting
-    void setReplacements(PlaybackReplacements* replacements) {
-        fReplacements = replacements;
+    // Replace all the draw ops in the replacement ranges in 'replacements' with
+    // the associated drawBitmap call
+    // Draw replacing cannot be enabled at the same time as draw limiting
+    void setReplacements(PlaybackReplacements* replacements) {
+        fReplacements = replacements;
     }
 
 protected:
@@ -96,6 +97,18 @@ protected:
                   SkCanvas* canvas,
                   const SkMatrix& initialMatrix);
 
+    const SkPicture::OperationList* getActiveOps(const SkCanvas* canvas);
+    bool initIterator(SkPictureStateTree::Iterator* iter, 
+                      SkCanvas* canvas,
+                      const SkPicture::OperationList *activeOpsList);
+    static void StepIterator(SkPictureStateTree::Iterator* iter, SkReader32* reader);
+    static void SkipIterTo(SkPictureStateTree::Iterator* iter, 
+                           SkReader32* reader, uint32_t skipTo);
+    bool replaceOps(SkPictureStateTree::Iterator* iter, 
+                    SkReader32* reader, 
+                    SkCanvas* canvas,
+                    const SkMatrix& initialMatrix);
+
     static DrawType ReadOpAndSize(SkReader32* reader, uint32_t* size);
 
     class AutoResetOpID {