Add layer counting to SkPictureRecord

src/core/SkPictureContentInfo.h

Index: src/core/SkPictureContentInfo.h
diff --git a/src/core/SkPictureContentInfo.h b/src/core/SkPictureContentInfo.h
index cfeedcf48312317ca0c4684b7cb536c5c78aa297..ed023e68a0ceae781d1db32404925891154aa016 100644
--- a/src/core/SkPictureContentInfo.h
+++ b/src/core/SkPictureContentInfo.h
@@ -19,6 +19,7 @@ public:
     bool hasText() const { return fNumTexts > 0; }
     bool suitableForGpuRasterization(GrContext* context, const char **reason,
                                      int sampleCount) const;
+    bool suitableForOptimization() const { return fNumLayers > 0; }
 
     void addOperation() { ++fNumOperations; }
 
@@ -27,6 +28,12 @@ public:
     void onAddPaintPtr(const SkPaint* paint);
     void onDrawText() { ++fNumTexts; }
 
+    void onSaveLayer();
+    void onSave();
+    void onRestore();
+    void rescindLastSave();
+    void rescindLastSaveLayer();
+
     void set(const SkPictureContentInfo& src);
     void reset();
     void swap(SkPictureContentInfo* other);
@@ -49,6 +56,25 @@ private:
     // This field is incremented every time a drawPath call is
     // issued for a hairline stroked concave path.
     int fNumAAHairlineConcavePaths;
+    // These fields track the different layer flavors. fNumLayers is just
+    // a count of all saveLayers, fNumInteriorLayers is the number of layers
+    // with a layer inside them, fNumLeafLayers is the number of layers with
+    // no layer inside them.
+    int fNumLayers;
+    int fNumInteriorLayers;
+    int fNumLeafLayers;
+
+    enum Flags {
+        kSave_Flag      = 0x1,
+        kSaveLayer_Flag = 0x2,
+
+        // Did the current save or saveLayer contain another saveLayer.
+        // Percolated back down the save stack.
+        kContainedSaveLayer_Flag = 0x4
+    };
+
+    // Stack of save vs saveLayer information to track nesting
+    SkTDArray<uint32_t> fSaveStack;
 };
 
 #endif